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==Personality==
Yusei is usually depicted as being calm and clear-minded even in very dangerous situations. Due to this he rarely acts on impulse and usually thinks things through before he plays any cards, always trying to stay one step ahead of his opponent. He also is very close to his friends and very hesitant to put them in harm's way. He is also shown to be very intelligent and very good at engineering, as he was able to build his own [[Duel Runner]] (D-Wheel in the Japanese verion) from scrap parts, twice, and how he jams the [[Criminal mark]] on [[Rally]]. Based on one of Akiza's lines in episode 80, he supposedly has some expertise in physics. According to the dub's second episode, Yusei has had a fear of Insects insects since a cockroach nested in his ear, as said by Nervin. He was however able to conquer this fear after his Duel against [[Lenny]].
==Biography==
===Pre-World Riding Grand Prix===
Half a year after the Duel with Rex Goodwin, Yusei spends most of his time preparing his [[Duel Runner]] for the [[World Turbo Grand Prix]]. He assists in investigating damage caused to Duel Runners, caused by [[Ghost]] and ends up dueling Ghost. When it appeared that Yusei was beginning to have the upper hand, Ghost summons his Synchro Killer, [[Machine Emperor Wisel Infinity]]. Utilizing "Majestic Star Dragon", Yusei was able to defeat Ghost and discovered that he was a robot. After meeting with Trudge, he explained that the robot he faced was known as a Riding Roid and that it was a test robot designed to see if they could be used in Sector Security's forces. Yusei feels that something big was coming and had to prepare for the worst.
He goes to Duel Academy and duels Heitmann, a teacher who plans to expell Leo and Luna's class because they are weak for using weak level monsters. Using some cards that the kids gave him, he wins the duel and proves that being weak isn't bad.
After the events at Satisfaction Town, Yusei returned to New Domino City where he meets with Trudge and Mina to find out more about Bruno. A bomb is set off causing everyone in the building to evacuate except for Yusei and Bruno because they got stuck in an elevator. Yusei spots Sherry and tells her to leave, when she explains that she was the one who set off the bomb. She also adds that the bomb was just for show, and there is no other one. Sherry walks away and Yusei and Bruno begin to pursue Sherry, but Yusei gets left behind. Mizoguchi explains that the only way for him to get through the door was to duel and defeat him. Meanwhile, Sherry was about to analyze a card that she believes holds the truth to her past when Bruno tries to stop her. Sherry starts to retaliate, and was about to punch his face when his eyes began to glow red. He stops Sherry from punching him and he throws her across the room. Bruno was about to punch Sherry when he spots the cards Sherry wanted to analyze. His eyes return to normal and he begins to help Sherry analyze the card. Yusei wins the duel, and he and Mizoguchi go to tell Sherry to stop. They arrive just as Bruno and Sherry read the analysis. They are shocked to find out that the card was normal. Then suddenly, the card begins to blow up the master computer, transporting Sherry, Bruno, Yusei and Mizoguchi to another location. They are startled to find themselves in a big bright space with a mysterious white figure analyzing them. Then, Yusei and Bruno wake up to find themselves on the shore of New Domino City with Mizoguchi carrying Sherry. Then, Yusei and Bruno wonder what happened in the bright light and if Yiliaster had anything to do with it.
He later appears to help Crow work out the kinks in his Duel Runner with Bruno's help, finding a strange circuit in the process. He later watches Crow duel [[Bolger]] and is the first to know that he is dueling with an Anti-Blackwing deck. While watching the duel, his birthmark, along with Crow's and Jack's, begin to glow before and after Crow summons his [[Black-Winged Dragon]]. Yusei then identifies this monster as Crow's Signer Dragon.
[[File:Team5ds large.jpg|thumb|left|Yusei and [[Team 5D's]].]]
After Team 5d's was formed, the group headed out to the practice track to get a feel for their new engines. During this practice run, Crow accidentally ran into a member of Team Unicorn and they demanded reparations. Andore, the team's ace, wanted the chance to duel Yusei. He agrees to this and starts the duel. He realizes while dueling him that he duels almost the same way as he does: analyzing every possible scenario before playing any cards and preparing for any circumstance. This didn't stop Yusei from summoning his Stardust Dragon; but just as Yusei was about to claim victory, the practice time limit ran out.
During the first round in the WRGP, Yusei ends up being the last duelist to face off against all of Team Unicorn due to Jack and Akiza losing to Andore. Yusei was able to claim victory over Andore, but not before he sacrificed his remaining life points to halve Yusei's. His next opponent, Breo, used a deck destruction strategy to try and defeat Yusei. But Yusei was able to counter his deck by using Breo's own strategy against him and summoned [[Junk Destroyer]]. Yusei had only one opponent left to face, the leader of Team Unicorn, [[Jean]]. After expressing his delight over facing all of Team Unicorn, the two begin the final duel of Round 1. In the end, Yusei won because of Jean's will to finish the duel "like he used to" which led him to attack Yusei's [[Rapid Warrior]] with his [[Phantomhorned Beast Phypnocorn]], but was intercepted by the effect of [[Stronghold Guardian]]. With this, Yusei pulled off a seemingly-impossible victory and won the first match of the preliminaries.
He's celebrates their first victory with his teammates when Sherry arrives to discuss what has happened to them up until now. They discuss the events about Ghost and the Machine Emperor Monsters, Lucciano, what she, Yusei, and Bruno saw that day at the Sector Security's compound, and the [[Imposter Jack Atlas]]. Sherry believes that Yliaster is behind all this and that they are being targeted because they are the Signers, which everyone is shocked to hear that Sherry knows about. The next day, Yusei, Jack, and Crow decide to see how Team Unicorn is doing in their match. Once they get there, they discover that they lost due to their Duel Runners crashing unexpectedly in their match against [[Team Catastrophe]].
While reviewing the duel, they figure out that when ever a player crashes, they manage to have the monster [[Hidden Knight -Hook-]] out on the field. While deducing this, Akiza gets involved in an accident similar to the one Crow was in and falls into a coma. They knew that Team Catastrophe was behind this and decided to beat them fair and square in the tournament to pay them back. Yusei and the rest of Team 5d's watches Crow's duel very closely to see what is the relationship between the crashes and the monster, Hidden Knight -Hook-. They soon discover that after its effect activates, a hooked hand appears from the shadow of its opponent's Duel Runner and causes their wheel to lock up. Even with this deadly monster on the field, Crow manages to stay in the game long enough, despite his still wounded shoulder, to win the Duel, destroy Hidden Knight -Hook-, and trade places with Jack. After the first two turns of the duel, Team 5D's manages to win the second duel due to Nicolas's Duel Runner being destroyed by his own card's effect. Both of the cards were given to Team Catastrophe by [[Placido]], who attempts to eliminate [[File:5Dx106Team up.jpg|thumb|right|Yusei teams up with [[Sherry]] and [[Mizoguchi]] to stop the [[Ghost]].]]team Team 5D's from WRGP. After his plan fails, he unleashes an army of [[Riding Roid]]s into [[New Domino City]].
Because of that, Yusei and others decide to fight against [[Diablo]] army. While Jack goes with [[Kazama]], Yusei goes with Sherry and Mizoguchi. After they beat some of them, Placido send all [[Ghost]]s to the trio. They quickly beat Mizoguchi and Sherry, leaving Yusei to fight alone.
