Oh right, my bad.
Tina must be the most accomplished character in the whole series of getting shit done. Lisa's still first because she's pretty much done everything, ever.
But Ein was more interesting. Hayate is just there... being a brother... who's just eye candy. Not even good eye candy.
EDIT: I should probably mention that the fact that he looks like Itagaki just stuck himself in the game as a bad OC makes me cringe every time.