Frostfire is not all bad in fact he is one of my favortie villins in TGH . Riversun i feel bad for her having mean parents and being a orphan must be hard for Rivesun . Brakentail is one of the best pegsi in TGh I know he was mean and rude only becuase Thunderwing belived that in the 1st book now Brakentail saw he was being a jerk and changed to be nice.
Star grew up in a herd that he had friends in, and he felt somewhat safe in Sun Herd. Nightwing may haven't had a life like that, so maybe this caused him to become a destroyer?