A shy, insecure girl who constantly apologizes for trivial matters and things she didn't even do. At one point she tried to become a tsundere. She seems to like Red King Crabs, receiving a printed t-shirt of it from Kino and buying a box of it at a convenience store.
Her name in Eastern order sounds like kagai (加害, "perpetrate"), and is most likely borrowed from former Morning Musume member Ai Kago.