my knowledge is a little muddy and not super reliable BUT what we do know is! cain (http://68.media.tumblr.com/bac7b9deb41f9c0c6194038577564fcb/tumblr_oirfgy8S0x1rzus3mo1_1280.png) loves to go around causing chaos, flirts a lot but mostly as a joke (including hitting on reinhardtzar once) (he gets punched in the face as a response) and is looking a little morally ambiguous atm, but is friendly for the most part.

he travels with leona (http://68.media.tumblr.com/57c595212f28a4d7d4bdbde3a6ec9368/tumblr_ola171w5ab1rzus3mo1_1280.png) who is his sister in law, she was married to his twin, abel (biblical references time) who died before the main crew got to meet them.

she's kinda like his babysitter p much because while he's good at fighting and capable of tactical thinking, he's also very...  quirky?? the type to act without thinking, do things just bc they look interesting, etc