Yuuki has feminine features, narrow chin, high cheekbones, and long mane raven-dark hair all of which gives Yuuki a handsome, but androgynous appearance. Yuuki wears the boys uniform, being, in actuality, male... yet, it still confuses the hell out of the other students, and sometimes even the professors. To make matters more confusing, Yuuki doesn't confirm whether he's a boy or a girl. He thinks it's funny that no one else can tell, and usually responds to the question (if asked politely) with a "Well, what do you think I am?" and/or with a good-natured "I'm whatever you want me to be, because I wouldn't want to disappoint you". For the record, Yuuki doesn't have a preference and flirts with both genders equally.

Yuuki is half-Japanese (Dad's side) and half-English (Mom's side) with both parents having Technical-Class Alices who work in Central town.

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Ability: The Alice of Constructs. Meaning Yuuki can build creatures out of whatever parts are handy and give it 'life' of a sort. It's not soul insertion, just Yuuki's Alice "programming" the construct for certain tasks and Yuuki subconsciously keeping it running. They only last for as long as Yuuki stays awake, but because too many and/or complex constructs can drain Yuuki's energy, Yuuki needs a lot of sleep... and if s/he has too many going at once, expect Yuuki to suddenly faint from exhaustion and all the constructs to suddenly go still.

It's quite the ability, with the mechanical creatures doing whatever Yuuki instructs them to do, however, since the constructs only last for however long Yuuki can manage to stay awake it's not considered powerful enough by Academy standards, and 2-Star status has been all he's allotted.

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Secret: Yuuki has a secret, second Alice ability; that of soul-transfer. Yuuki was mortified, and frightened, when Ambrose Passero approached him and said that he knew of Yuuki's secret Alice... and that Ambrose would be keeping Yuuki very close. Such an ability would place Yuuki in the Dangerous category, even promote him to 3-star or S-Star status, but Yuuki insisted on keeping his 2-Star rank and staying in the Technical class, like any other student... in return, Yuuki may be called upon in the future to "help" Ambrose.

Soul-Transfer enables Yuuki to take the soul, and therefore life, of another person or creature, and insert it into one of his constructs, thus giving it permanence instead of "turning-off" when Yuuki falls asleep, and also a mind of its own that only Yuuki can control... until Yuuki is forced to fall asleep, that is, leaving the construct to their own devices.