Annabeth can be sweet, but she /really/ loves fighting. She'll fight literally anything (and often wins. She doesn't really care much, though. She just loves fighting).

So called demon-type kinjao (well, half. Other half so-called dragon-type). Defected not long after Soul (another demon-type). Originally didn't get along well with Hiroki (angel-type, Soul's boyfriend), but eventually they warmed up to each other.