I'd probably classify as a "loli pervert"(Kirihara's boobs were entirely too big, if you ask me) as well, but still, she was the most consistently developed character in the show, and one of the few that had something akin to real personality. She wasn't as cute(well, to me she was, but you know what I mean) or cool as other characters, but I found her most realistic - and in this case it was for the better. Amber was cute, but had not nearly enough screen time, same with Yin(who, btw, was the reason I started watching the show), and Kiko was pretty much a comic relief character.
My other favorite character was Shihoko, at least the younger, short haired appearance.