Leo

Leo, short for Leonard, aka Rua or Lua in the Japanese version. He is Luna's twin brother, and was one of the Signers who possessed the Heart Mark of the Dragon. Including the only other Signer aside from Yusei, who has been able to weaken the "Meklord Emperors". He and Luna aid Yusei Fudo, whom they admire and support, in his Duels. Leo is the older twin of the two and has a lively and blundering personality.

Appearance
Leo's outfit is similar to his sister's; it consists of a short-sleeved white jacket over a sleeveless dark blue shirt with golden markings that differ from Luna's shirt. He also wears white shorts with a dark blue belt and blue sneakers of the same color. Leo also has a bracelet on each wrist, and his blue-green hair is pulled into a single, high ponytail with two shoulder-length bangs on both sides of his face but when he doesn't wear it up (like when he's sleeping) it looks like Luna's in the same situation. He carries a Duel Disk with a blue and white trim on his left arm, which was originally too big to fit until Yusei modified it.

On formal occasions, he wears a blue suit with a white shirt and blue bowtie under the jacket, and black loafers with white, knee-high socks. When he's sleeping, he wears light blue pajamas. If at school, he wears the New Domino academy boys uniform with a green book-bag.

Personality
Leo is a lively character (in the dub he is very carefree and acts dumbly), but is shown to get serious when the situation calls for it. Occasionally he will doubt his skill but his sister Luna always looks towards him for encouragement. He started off as cocky and sure of himself, but became more mature and careful as the series progressed.

He is also shown to be very perceptive in season 3, as he immediately felt something was not right about Lester even when he had not acted suspicious yet.

Yu-Gi-Oh! 5D's (Manga)
Both Leo and Luna were left to fend for themselves at a young age. In order to acquire money, the pair began to compete in Turbo Duels, even against adults where they were a raging success. But this was short lived as Luna fell ill, leaving Leo to Duel by himself. After losing, Leo was beat up by Nicolas as he couldn't afford to pay his side of the bet, leading to him getting beat up. Lazar witnessed this and promised to help Luna in exchange for Leo to undergo the Duel Dragon ceremony, which he accepted; acquiring "Power Tool Mecha Dragon" in the process.[6 ] Luna later underwent the same ceremony, acquiring "Ancient Pixie Dragon".

During the second round of the D1 Grand Prix, Mina Simington reported to Rex Goodwin that the semi finalists were being attacked by Leo and Luna. Leo boasts about how if he defeats Aria, it'll be his 5th victory that day and that the D1 Grand Prix contestants are weak. Luna agrees with him, stating that they're even weaker than he is. Leo then proceeds to attack Aria, winning. During the assault, one of "Power Tool Mecha Dragon's" screwdriver missles almost kills two bystanders, but Crow intercepts it with his "Blackwing Tamer - Hawk Joe the Jet Black". He then scolds Leo, who says he'll target Crow next. Later on, Goodwin informs the remaining contestants that he's dispatched Leo and Luna in the tournament as only the best should remain.[4 ]

Leo later appears before Yusei and Crow, the both of them mistake him for Sect but Leo scolds them for getting his identity mixed up with someone else. Crow mocks Leo and his sister, saying that they should be in bed as its late, but Leo mocks Crow back, calling him a "broom-head". Leo then proposes a Duel to Yusei, showing him his Duel Dragon, causing a Shadow Miasma to pulse from the card. Both Crow and Yusei feel it, surprising Luna. Leo also reveals that Goodwin is involved with the Duel Dragons to Yusei. During the Duel, Luna tells Leo that if any of her "Forest" archetype monsters are destroyed, she'll make Leo pay. Leo then manages to Synchro Summon his "Power Tool Mecha Dragon".[1 ]

Leo continues his assault, managing to power up his "Power Tool Mecha Dragon" with his Equip Spell Card strategy. Yusei manages to Synchro Summon "Seven Swords Warrior" in order to conduct an Equip battle with Leo, but his "Duel Dragon" steals Yusei's Equip Spell Cards. Yusei then uses "Sword Dance" which fires several solid vision swords at Leo and Luna, one of which hits Luna. This causes Leo's anger to increase, making the Duel Dragon's Miasma intensify. Leo then fills his entire Field with "Forest" monsters with cards to power up his "Power Tool Mecha Dragon" to 4800 ATK. It then beheads "Seven Swords Warrior", causing Yusei to lose 2500 Life Points with Leo telling Yusei that the Duel belongs to him.[7 ]

Yusei notices that Leo has someone to protect like he does and the spirit of a turbo duelist that can't give up for that person's sake. Leo yells that Yusei should't act like he knows as he was the one who hurt Luna in the first place. Leo starts to become more angry then he was before, causing his shadow miasma to become larger. Yusei activates his trap "Synchro Nova" to exculde six cards in his Graveyard and Special Summon "Gravity Warrior". Using both of its effects, Yusei defeats Leo. As Yusei's Sense was about to hit the twins, Leo protects Luna and shields her from the attack. Leo appears heavily injured from the attack and says to Yusei that things will be different in the second stage. When Luna threatens to make Yusei pay for hurting Leo, he calms her down and assures that although they lost, they did what they came to do and afterwards they both leave.[6 ]

On the boat heading to Satellite, Leo and his sister were enjoying a meal but Leo gets into a fight with Crow when he makes fun of him for losing to Yusei.[2 ]

Later, Leo and Luna are shown to have passed to the tournament's second stage. Their first opponent was Tetsu Trudge, but the twins defeated him with ease. Luna even called him weak.

Next, Luna is reading a fairy-tale book. She comments on the book like if it was a real story, and says that she must defeat the "dark wizard". Leo sadly notes how she is acting strange. Goodwin then appears to them as a hologram. He tells them that they must defeat the "dark wizard", and Luna realizes he is Yusei. Leo asks if that will bring Luna back to normal, and Goodwin confirms it. However, Goodwin's plans are only to test Yusei's Duel Dragon's strength, and for that, he needed to use another Duel Dragon. Leo and Luna then go after Yusei.

Background
Leo lives together with Luna in the Tops residential area. They spend most of their time alone together as their parents are usually at work. They are educated via the internet, so they spend most of their time inside. Later, both he and his sister attend the Duel Academy.

Fortune Cup Saga
Luna was able to sense Yusei when he was shocked by the police officers, so she and Leo rescue him after his Duel with Trudge and took him to their home. Yusei wanted to leave, fearing he may place them in danger, but Leo talks him into a Duel. After Yusei wins, they manage to persuade him to stay for the night. (In the English version, Yusei had lost his memory and Dueled Leo to help him remember.)

Leo and Luna awaken the next morning to find that Yusei had left after modifying their Duel Disks to fit their small arms. Leo then leaves with Dexter to find and Duel the Black Rose. They eventually meet up with Yusei again, and shortly afterward the Black Rose appears, but leaves after seeing Yusei's Mark of the Dragon, which seems to disgust her. Leo shows fear for both the Black Rose and the Mark.

Luna was selected as someone to participate in the Fortune Cup, but because she didn't feel like participating, Leo planned to disguise himself as her and compete instead, and Luna adds the saying "Leo wears makeup!". The next day, Leo enters the Fortune Cup in disguise as Luna, but quickly loses to Greiger after a hard-fought Duel. Using Zigzix's Signer-detecting technology, Lazar determines that Greiger Dueled Leo instead of Luna. During the consolation Duel where Luna Dueled Professor Frank, Leo was hypnotized along with his sister and later reveals to her that he had unconsciously given himself the task of protecting her while she protects the Duel Monsters Spirit World. He was awakened from his trance when the Duel ended.

At the end of the first day of the Fortune Cup, it is shown that Yusei would be paired against Greiger the next day. As Bolt Tanner wondered what kind of Duel Runner Greiger had, Leo tried to find out and ran off. He snuck into Greiger's garage, and got frightened by the look of Greiger's Duel Runner. His scream triggered a security alarm, locking him in the garage, where he slept until Greiger returned and found him sleeping.

Dark Signers Saga
At the end of the Fortune Cup, Leo, along with his sister, learns what a Signer is. He is worried about Yusei going by himself to Satellite after what the Dark Signer said.

After Yusei's Duel with Kalin Kessler, Tanner and Yanagi arrive at their home as they discuss the current situation. They are worried about whether Yusei had already fought against a Dark Signer or not. Then he asks Luna if it's true that "Power Tool Dragon" battled alongside the other Signer Dragons against the Earthbound Immortals, to which she responds that it may have. Leo immediately assumes himself to be the Fifth Signer and proclaims that he must also protect Luna as well. Yanagi re-asks and Luna says she only said yes to cheer up Leo.

In order for all the Signers to work together to fight the Dark Signers, Leo proposes that they seek help from Akiza. As they accept, he learns about the Arcadia Movement. Leo along with Luna, Bolt, and Yanagi, then go in search of Akiza. Upon reaching the Arcadia Movement base, they are tricked by Sayer. Leo then wakes up chained, and is made to Duel Sayer as a test in order to determine if he possesses any sort of ability, since he is Luna's twin brother.

Leo also learns that Sayer plans to use his psychic Duelists as soldiers in a war against the world for all the discrimination they have taken. As the Duel progresses, Sayer attacks Leo directly, making him cry, however he tells him not cry and instead fight. Due to the fact that he has revealed his true purpose, Leo's life is at stake now, and in order to save himself, he must awaken his hidden abilities.

Despite his determination after Summoning "Power Tool Dragon", the Duel ends in Sayer's victory. Leo then falls to the floor and passes out. He is later seen on a bed, with Luna watching over him. He and Luna are then rescued by Tanner and Yanagi, and before being able to leave the building they all witnesses the Duel between Akiza and Misty Tredwell.

After the building begins to collapse due to the Earthbound Immortal's assault on it, Tanner takes the two of them outside to safety. After Akiza lands in the hospital in a comatose state, Leo, along with Luna, as well as Jack are present within. As with the rest of the people there, he witnesses the Duel between Yusei and Akiza.

After it concludes with Yusei's victory, Leo tags along with Luna and the other Signers as they are invited by Rex Goodwin into his place, as he wants to reveals to them some secret concerning the Crimson Dragon, as well as some sort of deep connection between them and the Dark Signers. There he learns about their own "fate" which is responsible as for that the Signers to have met in someway. Leo finally learns that the Fifth Signer was already awakened long ago and that it will appear later on, and also about the Dark Signer's true identity involving the Netherworld, their abilities, and use of Earthbound Immortals.

After that Leo seems to accept the fact that he is not a Signer, he tells Luna that then there's no reason for him to go with them to Satellite, as the only thing he could if he did is to get in their way. However his sister tells him that he doesn't need to be a hero, just to be there to protect her as he promised from the start, that being the reason of why he accompanies her and the other Signers to Satellite.

Akiza, Leo, and Luna eventually meet up with Yusei and Jack, giving Yusei a morale boost and support so he will hopefully change his mind about refusing to Duel Kalin by saying that they will all fight along his side. Yusei and Jack both have friends to fight for, along with the protection of Satellite and New Domino City. An argument between Jack and Leo breaks out, as Leo says that he will definitely become cool like Yusei and Jack, but Jack insists that Leo will never become cool.

Afterwards, the Dark Signers perform some kind of dark ritual within Satellite, not only enclouding but also somehow vanquishing its other Satellite residents. Because of this, the Signers, along with Leo and Mina, all board a helicopter to Satellite being flown by Trudge himself. When they all arrive to Satellite they are greeted by Martha. However, the reunion is cut short as Yusei finds out that Rally, Crow, and the others have disappeared. Later during dinner, Roman suddenly appears, demanding to Duel. As Yusei accepts to Duel, accompanied by Akiza, Jack and everyone else take Martha and the kids to a safer place. As Roman and Yusei's Shadow Duel is about to begin, Luna, Leo, and Jack become aware of it as their Marks of the Dragon began to react.

After Yusei's match against Roman concludes, Jack, Akiza, and Luna, along with Leo, are present as the rest of the Dark Signers reveal themselves. Later on, as each one of the Signers is set on defeating their respective opponent, they split up to each of the four control units of the Original Ener-D Reactor. As Luna and Leo are taken by Trudge to where Devack is waiting, she instead travels into the Duel Monsters Spirit World in order to free Ancient Fairy Dragon. Due to this, Leo bravely challenges Devack to a Duel in her place, as he is determined to fulfil his promise of protecting her.

Despite Devack's warning that Leo isn't a Signer, and therefore he won't be able to beat him, the Duel begins and Devack is able to quickly inflict damage to him. However, Leo counterattacks by Synchro Summoning "Power Tool Dragon", his ace card. Devack then unleashes his Dark Synchro Monster, "Zeman the Ape King".

Leo, after getting a strategy together, is able to push Devack back by destroying "Zeman the Ape King". He gets backed into a corner again when Devack summons "Earthbound Immortal Cusillu". After Luna comes back, she sees her brother in trouble and takes over for Leo as a way of making it up to him. She and Leo then win the Duel together.

After Crow's Shadow Turbo Duel against Greiger ends, Leo, along with Luna, and Trudge are all currently witnessing the rematch between Yusei and Kalin. After the extreme Duel between the 2 finally ends, Leo, Luna, and Trudge accompany Yusei as he decides to go to the Original Ener-D Reactor directly in order to Duel against Roman one more time.

He watches the Duel between Yusei and Roman with Yusei winning. He watches in horror as Roman blows up the bridge and drops Yusei into the Ener-D Reactor. Leo at first believes that he is dead, but, like everyone else there, is surprised when Yusei returns, though unconscious. And after he wakes up and that everyone eventually go up through the same stairs they use before, they all notice in the distant the purple sparks, to which they can only believe means that Jack has won and also activated the third Tower.

Knowing that the last Tower to be activated is Akiza's task, Leo, Luna, Trudge, and Yusei all go to where it is. Arriving at and old and abandoned carnival the twins began looking for her and Mina. After Sayer awakens Akiza's power and is transformed once again into the Black Rose, they notice the tornado that has materialized after she summons "Black Rose Dragon". As they then get to the area where the Duel is taking place, they both notice Akiza's powers having once again manifested even stronger. After Mina and Trudge arrive, they all watch the outcome of the match, with Akiza emerging victorious. However they notice that it's too late for the last Tower to be activated, as the sun has already set.

They then see the Condor geoglyph that has appeared on the sky. The King of the Netherworld not only revives, but also is heading towards the formed Condor geoglyph, which is over New Domino City. However, the Crimson Dragon appears once again to take everyone to Rex Goodwin's mansion. Where he reveals to them his identity as the final Dark Signer and then declares that a Shadow Turbo Duel will be held within Condor geoglyph as a ritual to welcome the King of the Netherworld.

As Yusei, Jack, and Crow accept the Duel in order to stop the resurrection of the King of the Netherworld, Leo cheers for them along with his sister and the rest of the people who can only support them by watching while hoping they win.

World Racing Grand Prix Saga
Leo has enlisted into the New Domino City Duel Academy along with Luna. Dexter also accompanies them as the 3 of them are pupils there of Miss Bartlet. Long after that Leo, Luna, and Dexter go to a haunted forest were people are reported to disappear. Soon after they venture into the forest, Luna disappears. Leo then goes looking for her while Dexter goes to get Yusei. Leo finds a mansion and sees Luna in a window. A boy then appears, preventing Leo from entering. Leo Duels the boy, whose name is Haley, as Haley believes that Leo is there to hurt his sister. When Yusei arrives, Leo asks Yusei to help Luna and leave him fighting Haley. Yusei gets in and assists Luna. Luna wants to help the spirit of Claire, who is still in the house, and finds a special card. Leo defeats Haley, whom he finds out is just a spirit, and Luna is free. Luna gives Haley the special card and Haley and Claire disappear. Leo and the gang appear at the Riding World Grand Prix premiere.

Leo and Luna watch Akiza on her first day of riding a Duel Runner. After the lesson, the two accompany Yusei and Akiza to a skating rink so Yusei can show Akiza a few tricks. He comments that this is a date to his sister and Luna agrees at some point.

When Lester enters Duel Academy, Leo gets very suspicious about him and tries to protect his sister from him. Lester does all he can so he can keep him separated from Luna. While stuck at school, later knowing it was a trick, he sets out to find Lester's mansion and discovers he Duels using a skateboard for riding Duels. After finding this out he asks Yusei to construct a similar device in order to challenge Lester. Yusei constructs a Dueling skateboard dubbed a Duel Board for Leo. He tries to gain some experience riding it, though he has difficulty at first. He then meets up with his sister, who is also trying to practice with the board Lester gave her. However, the skateboard Luna receives is controlled by Lester and forces her to Duel him. Leo then joins the Duel to protect his sister.

During the Duel, Leo identifies the mysterious Duelist as Lester. Luna quickly summons "Ancient Fairy Dragon", but loses it to "Machine Emperor Skiel Infinity" and things begin looking grim. Leo summons "Power Tool Dragon" to try and turn the Duel around, but Lester upgrades "Skiel Attack" and its ability attacks him directly. Despite the fact that Leo could not defeat Lester, Leo did succeed in making Lester so mad that he rushed to finish the Duel without capturing Luna's "Ancient Fairy Dragon", his likely goal all along. Leo is blown off the track and falls, only to be saved by the Crimson Dragon. The Dragon's sudden appearance surprises everyone, even their mysterious spectators. After the Duel, the twins backtrack where Lester lived, only to find an empty space. No one else in Duel Academy seems to recall him either. Despite the fact that the Duel was one in which damage was real, Lester brushed off Luna's attack, but for some reason Leo seemed able to hurt Lester (it is not known why though).

Leo appears during the beginning of the WRGP as a part of Team 5D's pit crew.

During Yusei's Duel with Aporia, Leo, along with the rest of the team, is shown a vision of the future, which leaves him in disbelief, but not to the point where he gives up on the future they're creating. After hearing from Sherry LeBlanc that Yusei will die if he enters Divine Temple, Leo breaks down into tears, questioning if it's really worth it for Yusei to risk his life. He then cries out that he doesn't want Yusei to die, but Yusei reassures the boy that he won't.

Ark Cradle Saga
Leo and everyone else on the team accompany Yusei to Divine Temple. After they are split into three groups due to Z-one's trickery, Leo travels with Luna and Jack to the center of the structure unaware that Aporia would be waiting for them at the second gear fully repaired. He is then forced into a 3 on 1 Duel with Jack and Luna with their life on the line. Despite his attempts to power up "Red Dragon Archfiend" and protect Luna's Life Points, his strategy backfires after Aporia Summons "Machine Imperial Soldier Grannel Ein" and knocks out both of his partners, destroying Jack's Ace monster. Aporia then declares by the current situation that Leo would have to continue alone against him after he ends his turn. Leo, in his efforts to protect Luna, manages to Special Summon "Power Tool Dragon" and "Ancient Fairy Dragon" which, ultimately, leads to his death. However, he is revived due to the effect of his "Morphtronic Lantron" and the power of the Crimson Dragon, obtaining the Heart Mark of the Dragon, making him the sixth Signer. Finally he Synchro Summons "Life Stream Dragon", and is able to restore Luna's, Jack's, and his own life points due to its effect (their wounds were also healed, but it is currently unknown why). When he attacks Aporia during this turn, it marks the only time in the Duel that Aporia appeared to be physically affected by taking damage (for unexplained reasons). They finally defeat Aporia by reducing Aporia's strongest monster's ATK. After meeting up with the whole team, they venture deeper into Divine Temple and finally find it's main inhabitant. The team is surprised when Aporia who was presumed dead reappears and initiates a Duel with Z-one, aiming to remind him of hope. Even though he manages to summon the three Meklord Emperors, they are of no use against Z-one's Time Lords and eventually he is defeated. Realizing the power of Z-one's Deck, and following the example of Jack, Crow and Akiza, along with his sister, Leo gives Yusei his "Power Tool Dragon" and his "Life Stream Dragon", hoping to aid him in the last battle.

Team 5D's Future
About half a year after the battle with Z-one, the twins receive a letter from their parents. In it, they tell them that they want to live together, but for that to happen, they may have to leave New Domino City. Leo and his sister are unable to decide what to do because they want to stay with the gang. After Jack challenges Yusei to a Duel which he agrees, the twins along with Akiza and Crow watch the Duel. They ultimately decide to go with their parents, and years later, Leo would become a professional Turbo Duelist.

Yu-Gi-Oh! 3D Bonds Beyond Time
Yusei Fudo had a nightmare about the Zero Reverse incident that his father created. With Yusei upset, Jack Atlas and Crow Hogan decided to have a Turbo Duel to cheer Yusei up. After driving down the highway, Paradox, who traveled back in Yusei's time, challenges Yusei to a Turbo Duel. After a few turns, Yusei tunes "Junk Synchron" with "Junk Warrior" and Synchro Summons "Stardust Dragon", but Paradox reveals a blank card and launches a beam at "Stardust Dragon", absorbing it and creating a blackened corrupt card of it into the blank card. Yusei confronts Paradox, who shows him the corrupt card, before vanishing through time again. Yusei, Jack and Crow halt their Duel Runners and look in bewilderment at the original "Stardust Dragon" card, whose illustration has just been blanked.

Yusei, Jack and Crow then started questioning about Paradox's identity at their garage, when Akiza Izinski, Leo and Luna arrived and showed the archives they found about the past. They found an old article about "Maximillion Pegasus" and "Yugi Muto", with Yusei recognizing Yugi as a legendary duelist. They also discovered a record of "Stardust Dragon" assaulting various duelists in Europe. Knowing that "Stardust Dragon" could not have existed in that era, Yusei zooms in on the article's picture to discover Paradox standing in the background of the dragons. Outside, New Domino City begins to crumble and collapse. Witnessing the destruction, Jack Atlas realized that "Stardust Dragon's" existence in the past is now changing the future, which is their era.

With the support of the other Signers, their marks begin to glow as the complete Crimson Dragon appears on Yusei's back followed by Yusei's Duel Runner glowing as well. Yusei feels himself being called by the Crimson Dragon and beckons Yusei to board his runner. With its help, a time slip is opened and Yusei begins his chase after Paradox.

In Venice, Paradox finds Jaden Yuki, who still has the powers of Yubel and The Supreme King. Paradox attacks him with "Cyber End Dragon" and "Rainbow Dragon". Jaden manages to resist by Summoning "Elemental HERO Neos" to protect him. In response, Paradox Summons "Stardust Dragon", a monster from the future, and proceeds to overwhelm Jaden (This scene is how the movie opens before changing to Yusei's nightmare of Zero Reverse). Stardust Dragon's first attack almost destroys Neos and sends the two skidding backwards into a wall.

As Paradox commands Stardust Dragon to attack Jaden again, Yusei appears with the Crimson Dragon, who takes the blows for Jaden. Paradox disappears once again.

Soon, Yusei and Jaden began to chat on a roof. Seeing Yusei's Duel Runner, Jaden gets excited seeing such a technology, asking Yusei if that was the Duel Disk of the future. He then explained that he came here because he heard that there were cards missing from duelists. Yusei explains to Jaden that Paradox is trying to change the past and that his target was Maximillion Pegasus. Jaden then used his laptop to find out an article about the event that Paradox performed that would create a major historical event. (In the English version, Jaden did not believe Yusei, which is why he opened his laptop and discovered that truth.) Jaden then checks his card, as his "Elemental HERO Neos" card turns into a blank card. As the country began to collapse, Yusei tells Jaden that they must hurry to save the world.

Yusei and Jaden then ride Yusei's Duel Runner, with the Crimson Dragon taking both of them even further back in time.

Meanwhile, in Yugi's timeline, sometime after Battle City but before the Waking the Dragons arc, Maximillion Pegasus is currently holding a tournament. The [http://en.wikipedia.org/wiki/Sakiyomi_Jan_Bang! Sakiyomi Jan Bang! ] made a cameo as the MC of the event. Yugi and his grandfather, Solomon Muto, noticed "Stardust Dragon", "Cyber End Dragon" and "Rainbow Dragon" in the sky. Paradox then attacks the crowd with "Cyber End Dragon" and "Stardust Dragon", killing almost everyone, including Pegasus and Yugi's grandfather.

Amongst the ruins, Yugi is the only survivor against Paradox's attack. He stands up and searches for other survivors. He finds a bandanna belonging to his grandfather and cries over his death. He then sees Paradox laughing on top of a building, happy that he finally completed his mission. At that moment a crack in the space appears and the Crimson Dragon suddenly "swallows" Yugi. Then, Yugi is thrown back in time at the same place half an hour earlier. Yusei and Jaden find Yugi and explain to him what they know about Paradox to him. Yugi agrees to fight with them against Paradox to free the trapped monsters and save the world.

At the event, Jaden Summons Yubel and starts to scare the audience, so they would flee. By doing so, Yugi hopes the future is safe as Jaden regains his "Elemental HERO Neos" card. However, Paradox arrives regardless to the shock of the heroes. After Paradox took his mask off and introduced himself, Yugi asks Paradox what kind of person he is. Paradox replies that he is from a future which was destroyed by Duel Monsters. He intends to destroy the game of Duel Monsters to prevent that future from happening. Yusei tries to tell Paradox that by changing time and trying to destroy Duel Monsters, he will also erase people from the timeline as well, to which Paradox replies that it is what he is looking forward to the most. Yusei, Yugi and Jaden challenge Paradox to a 3 on 1 Duel, with a time limit of 20 minutes, before Pegasus arrives at the event and the other dimensions crumble to pieces. Jaden's eves change color as Yubel appears behind him and Yusei's Mark of the Dragon glows as the Crimson Dragon roars behind him as the two Duel Kings say their catchphrases and then Yami says to Yugi that the Duel against Paradox would be the toughest and Yugi responds by saying that they should rise to the challenge. Yugi transforms into Yami and says his catchphrase as Paradox accepts this challenge and the Duel begins.

Paradox's Duel Runner  transforms into a flying type and he floats up high and the Duel begins.

Paradox declares the first move. He activates "Malefic World" that lets him put a random "Malefic" monster from his Deck to his hand instead of drawing a card during his Draw Phase. The field begins transforming into a purple atmosphere full of stars. Then, he sends "Cyber End Dragon" from his Extra Deck to the Graveyard to Special Summon "Malefic Cyber End Dragon" from his hand. He sets a card to end his turn (because in a 3-on-1 Duel, you cannot attack on the first turn). By this time, Yugi, Jaden and Yusei come to the realization why Paradox has been stealing monsters: He's using them to Summon the "Malefic" monsters, as Yugi understands that by destroying a monster's good version, Paradox can Summon their dark version.

Yusei tells everybody that despite them never fighting together before, they must work together to defeat Paradox, as Yugi & Jaden agree. Yugi then asks Yusei to take the first turn for his team.

Yusei activates "Reincarnation of Hope", which sends "Sonic Chick" and "Quillbolt Hedgehog" from his hand to the Graveyard; but on their team's second Standby Phase, they are allowed to add a monster from their Deck to their hand. Yusei then Summons "Junk Synchron" and due to its effect, he also Summons "Sonic Chick" back on his field. He then activates the effect of "Quillbolt Hedgehog" to Summon it back to his field. He then uses the 3 monsters to Synchro Summon "Junk Gardna" in Defense Position. Yugi becomes surprised by the concept of Synchro Summoning, as Jaden is just as confused by Yusei's Synchro card, but praises Yusei's play and shows his interest in the future cards. Yusei Sets 2 cards to end his turn.

Paradox adds "Malefic Rainbow Dragon" to his hand due to the effect of "Malefic World". He then sends "Rainbow Dragon" from his Deck to the Graveyard to Special Summon "Malefic Rainbow Dragon" from his hand. Jaden then becomes angry since Paradox is using Jesse's card. Paradox attacks "Junk Gardna" with "Malefic Rainbow Dragon", but Yusei activates the effect of "Junk Gardna" that switches "Malefic Rainbow Dragon" to Defense Position, thus stopping the attack. Paradox then attacks "Junk Gardna" with "Malefic Cyber End Dragon", this time destroying it and inflicting Piercing Damage to Yusei's Life Points. Yusei felt the real damage that Paradox did to him, but not before activating "Junk Gardna's" 2nd ability, which switches Paradox's other monster in Defense mode and "Miracle's Wake", reviving his "Junk Gardna". Yusei apologizes for losing some Life Points, but Yami and Jaden insisted that Yusei did a good job, stopping the assault of both monsters. Paradox then Sets a card and ends his turn.

As Jaden's turn begins (his theme song plays in the Japanese version), he asks Yusei if he may borrow "Junk Gardna". Yusei agrees, as Jaden activates "Polymerization", fusing his "Elemental HERO Neos" with Yusei's "Junk Gardna" to Fusion Summon "Elemental HERO Neos Knight". The ATK of "Elemental HERO Neos Knight" increases by half the ATK of "Junk Gardna", making it 3200. Because of the other effect of "Elemental HERO Neos Knight", it can attack twice during the same Battle Phase. Thus, Jaden attacks Paradox's "Malefic Rainbow Dragon" and "Malefic Cyber End Dragon" with "Elemental HERO Neos Knight". Paradox activates "Malefic Tune", allowing him to draw 2 cards. Jaden Sets four cards to end his turn.

Paradox adds "Malefic Stardust Dragon" to his hand due to the effect of "Malefic World". He then sends "Stardust Dragon" from his Extra Deck to the Graveyard to Summon "Malefic Stardust Dragon". Yusei then became shocked to see that his ace monster became corrupted and in the English dub he yells at Paradox, calling him a snake and is horrified at what has been done to his card. Paradox then Normal Summons "Malefic Parallel Gear" and tunes it with "Malefic Stardust Dragon" to Synchro Summon "Malefic Paradox Dragon". Yusei is stunned by this, to which Paradox says that he is not the only one who could Synchro Summon. He activates its effect, Special Summoning "Stardust Dragon" and decreasing the ATK of Jaden's "Elemental Hero Neos Knight" by 2500. Paradox attacks "Elemental HERO Neos Knight" with "Malefic Paradox Dragon", but Jaden activates "Hero Barrier", negating the attack. Yugi and Yusei praise Jaden for that move, but Paradox activates "Malefic Claw Stream", destroying "Elemental HERO Neos Knight", but Jaden activates "Elemental Mirage", resurrecting "Elemental HERO Neos Knight" with its original ATK (2500). He explains to Yugi and Yusei that he did this to ensure that there was at least a monster on the field by Yugi's turn. Because of the effect of "Malefic Paradox Dragon", the ATK of "Elemental HERO Neos Knight" is reduced to 0. Paradox Sets 2 cards to end his turn.

As Yugi's turn began (his theme song plays in the Japanese version), he adds "Dark Magician" to his hand due to Yusei's "Reincarnation of Hope". Paradox knew that he would try to go for the "Dark Magician". Yugi activates "Ancient Rules", which allows him to Special Summon it. The Dark Magician, however, is still affected by the effect of Malefic Paradox Dragon, reducing its ATK to zero. Jaden gets excited seeing Yugi's ace card, while Yusei remembers based on the archives, the Dark Magician is Yugi's ace monster. At this point, Yusei asks Yami to destroy Stardust Dragon, since Malefic Paradox Dragon's effect will prevent them from launching an attack. Yugi then activates "Bond Between Teacher and Student", which Summons "Dark Magician Girl" to his field. Yami then activates "Magic Gate of Miracles", which lets him take control of one of Paradox's monsters and which Paradox assumes it is his "Malefic Paradox Dragon". In response, Paradox chains "Malefic Force", which protects his "Malefic Paradox Dragon" from Yami's card effects. Yami then smiles claiming his true target is "Stardust Dragon". Now Yusei gets his "Stardust Dragon" back on his field. Jaden then praises Yami for this, noting that Yami never wanted Malefic Paradox Dragon in the first place. By doing so, Malefic Paradox Dragon's effect is negated, thus returning the Dark Magician & Elemental Hero Neos Knight's ATK to their original amount. Yami then activates "Dark Magic Twin Burst", combining his two monsters' ATK together, raising the ATK of "Dark Magician" to 4500. He attacks and destroys "Malefic Paradox Dragon", resulting in Paradox losing 500 Life Points. Paradox then grins, claiming that these desperate moves change nothing. Yugi disagrees, mentioning to Paradox that he had two monsters and now he has none. Paradox mentioned that they only created the path for the Summoning of a powerful monster and activates "Malefic Paradigm Shift", which Summons "Malefic Truth Dragon" to his field when his "Malefic Paradox Dragon" is destroyed. This costs Paradox half of his Life Points to activate (Paradox: 1750 Life Points). Paradox then fuses with his new monster and everyone is amazed to see such a gigantic monster. Yugi then Sets 2 cards face down and ends his turn.

By now, time has run out as Pegasus is about to arrive, but cannot land his helicopter due to Malefic World still being in play. Back in New Domino City, everybody is watching their dimension collapse but Jack knows that Yusei still has a chance.

Paradox then starts his turn. He plays "Malefic Selector" to remove "Malefic Parallel Gear" and "Malefic Cyber End Dragon" from play to add "Malefic Blue-Eyes White Dragon" and "Malefic Red-Eyes Black Dragon" to his hand. Paradox then sends both "Blue-Eyes White Dragon" and "Red-Eyes Black Dragon" from his Deck to the Graveyard to Summon "Malefic Blue-Eyes White Dragon" and "Malefic Red-Eyes Black Dragon".

Yugi is shocked that the "Red Eyes Black Dragon" & "Blue Eyes White Dragon" have become Malefic monsters as well. Paradox then attacks "Dark Magician Girl" with "Malefic Red-Eyes Black Dragon". At that point, he also mentions Malefic Truth Dragon's ability: If a Malefic monster destroys one monster, the other monsters are destroyed also. Jaden then activates Yugi's "De-Fusion", sending Elemental HERO Neos Knight back to the Extra Deck and Summoning his "Elemental HERO Neos" and Yusei's "Junk Gardna". Yusei then uses the effect of "Junk Gardna" to switch "Malefic Red-Eyes Black Dragon" to Defense Position, thus canceling its attack. Yugi praises both Jaden and Yusei for this impressive display of teamwork but then Paradox then attacks "Dark Magician" with "Blue Eyes White Dragon" and destroys it, costing Yugi, Yusei and Jaden 500 Life Points. He then activates the effect of "Malefic Truth Dragon" which would destroy all of Yami, Jaden and Yusei's monsters, but Yusei activates the effect of "Stardust Dragon" to negate the destruction effect of "Malefic Truth Dragon" and destroy it. However, Paradox activates the effect of "Malefic Truth Dragon" which removes from play his "Malefic Rainbow Dragon" and negates the effect of "Stardust Dragon". He then attacks "Elemental HERO Neos" with "Malefic Truth Dragon" and thus activating its effect again, destroying "Dark Magician Girl" and "Junk Gardna". Also, for every monster destroyed, Malefic Truth Dragon inflicts 800 damage. Yami, Jaden and Yusei's Life Points are all reduced to 500 as all 3 of them are pushed back by the explosion. Paradox then activates "Malefic Divide", Special Summoning "Malefic Stardust Dragon" from the Graveyard. He then orders it to unleash its fury so that Duel Monsters will perish forever. Yusei falls to his knees, saying that everything is lost and the future is doomed. Jaden tells Yusei not to surrender reminding him that they have a "secret weapon" on their side. Yugi also tells Yusei that other than Paradox, they believe in Duel Monsters. To show him what he means, Jaden activates "The Flute of Summoning Kuriboh". The effect of "Flute of Summoning Kuriboh" allows Yami to add "Kuriboh" to his hand. Yami then discards "Kuriboh" to reduce the Battle Damage to 0. Paradox ends his turn, but not before "Malefic Stardust Dragon" gets destroyed by the effect of "Malefic Divide" and the original "Stardust Dragon" gets Summoned back to Yusei's field due to its ability. Yami then tells Yusei that no matter which era he is in, his friends will always be supporting him.

Yusei gets up, as Yami & Jaden tell Yusei to end the Duel, as they promise to aid. Yusei activates "Stardust Mirage", Special Summoning all monsters that Paradox destroyed during this turn. This brings back "Dark Magician Girl", "Dark Magician", "Elemental HERO Neos" and "Junk Gardna". Paradox is shocked, as all the monsters previously destroyed in his turn are Special Summoned back to their field. Yusei then draws a card to start his turn, as Jaden then activates "Neos Spiral Force", doubling the ATK of "Stardust Dragon" to 5000. Yami then activates "Dark Spiral Force". This then doubled Stardust Dragon's attack again to 10000. Yusei attacks "Malefic Truth Dragon" with "Stardust Dragon" and the combined efforts of "Dark Magician" and "Elemental HERO Neos", winning the Duel and restoring peace. Paradox is destroyed by the attack and is never to be seen again. Pegasus is finally able to land and arrive at the event.

After the Duel, Yusei thanks Jaden and Yami Yugi and hopes to meet them again. As Yami Yugi looks down from the rooftop towards the event where Pegasus is among the crowd. Yami Yugi gives a friendship speech and Yusei and Jaden return to their respective timelines. Back at New Domino City, everybody comes running to Yusei as Yusei himself looks at the sky and hopes to protect his future so that one day, he can meet Jaden and Yugi Muto/Yami Yugi again. In the English version, he also says that the true magic of Duel Monsters isn't in the cards, it's the bonds we forge because of it.

Luna
Leo and his sister are known to be together in almost every scene of the show (not included in the Fortune Cup) and have an extremely close bond. Throughout the entire show, it is made apparent that in every situation involving Luna, Leo is the one to give her the strength to fight back. Even though Leo appears to be completely ordinary, when his sister goes to the spirit world, he is somehow able to communicate with her. It is said that when Luna went into a coma state when she was 3, Leo was the only one that believed she would awaken, and was said to be the one that awoke her from the spirit world. So far, only Leo has been able to awaken Luna when she goes to the spirit world. Luna is the most important person in his life and he will protect her at any cost from dangers; to Luna, Leo is her 'hero' and she can't live without him. It is a known fact that Leo and Luna go together to Duel Academy along with Dexter and their teacher Miss Bartlet. Even though the twins have their ups and downs they love each other dearly and are considered the most valuable person in the other's life. When they were battling Devack and his Earthbound Immortal he said he wanted to show that he can protect his sister from harms way including from Devack and Luna tells Devack she will never forgive him hurting the person she cares about most in the whole world. He also feels that he is useless and can't protect her from harm but Luna says she needs him. In the original he said she was a bother to him while in the English dub he said she was holding him back. In the Duel with Aporia, after Luna got knocked out from Machine Imperial Soldier Grannel Ein, it had a devastating effect on him similar to the first of Aporia's embodiment of despair Lester had his parents lost. This Duel further affects him in his confidence of protecting Luna, while at several parts of the Duel Aporia counters all of Leo's moves leaving both Jack and Luna close to death. This makes him to force himself to be stronger and literally put his life at risk to protect Luna, best demonstrated by using Double Ripple to summon Ancient Fairy Dragon for Luna, which costs him his life (for a brief moment) and was reborn as the Sixth Signer with Life Stream Dragon.

Leo has shown strong protectiveness and jealousy when someone flirts with his sister, or when she shows romantic interest in someone (particularly in the Japanese version). After the fight with Z-one, Leo blushes upon seeing Luna in new clothes, commenting on them while turning away and smiling (and being noticeably flustered).

Yusei Fudo
Yusei Fudo is shown to be like a brother-figure to both Leo and Luna. Leo is shown to look up to Yusei as the best Duelist ever. Yusei has given Leo many tips when it comes to Dueling and has inspired Leo to become even better. This is seen after Leo faces against Devack, to which during the Duel Yusei notices that Leo is Dueling more carefully, realizing that he has changed and grown up since their first Duel. Because of this, after the Duel ends, Yusei congratulates and tells Leo that he did well.

Akiza Izinski
Leo looks up to Akiza Izinski as a Duelist, even when she went under her alias, the "Black Rose". Although he was somewhat scared of her, he still admired her abilities. He wants to be ranked at the top of his class like she is. He also relied on her to stand up for their right to Duel in the Duel Academy. He often refers to her as "Big Sister Aki", and has great respect and love for her like a sibling. (Japanese version only).

Jack Atlas
In episode 13, Leo is shown to admire Jack Atlas from the time the latter reigned as King. He has figurines of Jack and his Red Dragon Archfiend, but now thinks of Yusei as the better Duelist after the Fortune Cup, much to Jack's annoyance. Even if he does, Leo was inspired by Jack to become a great Duelist. During the Duel against Aporia, Jack notices something new about Leo and said that Leo would protect anyone at any cost even if it means giving up his life. Although not seen too much, Jack has shown concern for Leo, like a surrogate father/older brother to him, and tells Leo to never give up fighting (which occurs when Aporia tries to get Leo to give up, and when Leo dies from Aporia's attack for a moment).

Bob and Dexter
Bob and Dexter are Leo's friends, as he is seen to hang out with them at Duel academy (and has known Dexter before he met Yusei).

Aporia
Like the other members of team 5D's, he saw Aporia as an enemy. During the Duel in the Ark Cradle, Aporia constantly caused Leo to feel despair by attacking Jack and Luna, but instead, Leo responded by fighting bravely and died for a moment, but then was revived as a Signer, and with Jack and Luna, he shows Aporia hope. During Aporia's Duel against Z-ONE, Leo showed respect towards Aporia and was constantly worried when he got hurt. When Aporia died, Leo was shown to be sadder than anyone else, then he angrily yelled at Z-one for killing him. Before Aporia Dueled Z-one he told Leo that he saw the hope that he possessed within him, and that hope was the very same that Aporia had been seeking.

Knownable Relatives

 * Luna (younger twin sister)
 * Yusei Fudo (Surrogate older brother)
 * Akiza Izinski (Surrogate older sister)
 * Jack Atlas (Surrogate Father)
 * Unnamed parents

Trivia

 * Yhe Japanese names of the twins to be Rua and Ruka. However when their names appeared wrote out in the Japanese anime, they were Lua and Luca. The differing in names are due to Japanese speakers pronouncing "L" and "R" as the same sound. When he Dueled Haley in the Japanese version, his name was spelled Rua. When the twins Dueled Lester their names were spelled Lua and Luca.
 * The 4Kids Entertainment website initially listed the twins in the character section. Here Lua has his name changed to Luka, while Luca has hers changed to Luna. Both characters have since been removed from that section of the website.

Voice Actresses
Japanese : Ai Horanai

English : Cassandra Morris (episode 11 - episode 64), Eileen Stevens  (episode 65 - present)