Aido defently, especially after seeing Akatsuki's anime design. ^^;
Kain is more mature and he rocks for it, though low half he aint really a sense of humor, and the opposuite implys for aidou to, the downer for aidou is he... well.... dislikes yuki ;-; and for god knows what reason? (maybe it is like what the poster said before and because he likes her? though there is no other answer i can think of and its not like we have seen any hints coming from his side of feelings.) on the other hand he is hillerious.
KAIN!!!!! YAY!!! HE'S SO WILD!!!!!!! okay, okay.... i geuss i'm not a rabid fan girl but... still... aidou is just cute... he isn't very fantasy fullfilling