Yusei is the protagonist of the Yu-Gi-Oh 5D's anime and manga. He is one of the Legendary Signers originally possessing the Tail Mark of the Dragon and later the Head Mark of the Dragon. His ace monster is Stardust Dragon which has the ability to protect against any destruction effect. Stardust Dragon also has a whole archetype of support cards that Yusei uses to bring him out quicker or turn him into one of his more powerful forms.
How to Unlock
To unlock Yusei Fudo, you have to achieve a mission: Summon WIND-Type Monster(s) 10 time(s) in total. Once you claim the reward for the mission, "Complete all Character Unlock Missions" is also achieved. Junkuriboh is a reward for the mission, and now you unlock Yusei Fudo as a playable character!
Tuning Can be used each time your LP decrease by 1800. In the Draw Phase, instead of doing a normal draw, draw 1 "Synchron" tuner monster of your choice, and send the card of the top of your deck to the Graveyard. This skill can be used once per Duel.
But then again, we already have Luna, who even with 30 levels, still have the worst level up rewards in the game.
The fact that Yusei doesn't have Clear Mind/Crimson Dragon Draw as an alternative to Destiny Draw really, REALLY sucks. He doesn't even get Balance as a common skill. Seriously, hop off Yami's dick already, Konami.