Personality and Traits: The thing that Yoite craves the most is to be erased and he'd do anything to make it happen. It is because of this that Yoite dislikes (fears?) socializing; meeting new people, developing new friendships would be only a burden for him. New chains that would shackle him even more to the world that he so much desires to leave.
Although, to sum it up like that wouldn't completely tell everything about this side of his character. Yoite doesn't know how to socialize as much as he dislikes it. Living in a basement with little, if any, contact with the outside world made him grown up without this ability.

Despite being a taciturn kind of guy who only talks when he has to, only short and to the point every time he does, Yoite is actually really polite. He'll greet you and thank you properly when he ought to. And thus he doesn't dislike helping a person, he simply can't stand gratitude. He doesn't like being touched or, even worse, caressed. He's pessimistic, and can't stand optimism. He completely loathes himself, thinking that he's just a hideous burden and thus he wants to disappear. Without happy memories, without friends that would cry at his death, erasing completely all of the sins he has committed since his birth. And all of the people he has killed because of Kira.