Kris is an enigmatic and shy human. He talks very little, and usually only to his friends. He is neutral in killing or sparing enemies. He might be unstable, as he sometimes does creepy things when out of the player's control.
Susie is your average bully, she prefers to kill or terrorize enemies, but will spare them and make them happy when ordered. She actually cares a lot about her friends.
Ralsei is a caring, loving, fluffy prince of darkness. Nothing much else to say.