Well, Larek said Zan had always tried to do the right thing back on Antar. Ava and Rath were just tough, in my opinion. Lonnie was the only one who seemed to actually have bad intentions. And back on Antar, Vilandra betrayed her family for Kivar.
Which I always wondered about. how come no one knew about that? Or if they did know, why would they send her to Earth?