Actually... Everyone has a bad side. Kid, too, has a bad side. For balance to exist, good and bad must maintain perfect equilibrium. Kid 说 that one himself, and I doubt he would exclude himself from this. Even our precious Kid has a bad side, because he is balanced. Of course, that doesn't make him any less perfect. It actually makes him 更多 perfect, because he is 更多 balanced, and balance is absolute and undeniable perfection. It even happens in the manga.