Okay, so I had to look this up because 'Autumn Rayne' isn't a huge mainstream title I know by heart—it sounds like it might be a romance or fantasy novel, maybe indie or web-novel? From what I could gather, the central characters are usually built around the titular Autumn Rayne herself.
Typically, Autumn is the protagonist, likely navigating some personal journey or a new environment, possibly discovering hidden powers or a secret past if it's a fantasy. There's almost always a love interest, maybe a brooding guy with a mysterious connection to her story. If it's a school setting, there'd be a best friend character for support and a rival to create conflict. The roles are pretty archetypal: the heroine on a path of self-discovery, the romantic foil who challenges her, the ally who provides comic relief or grounding, and an antagonist tied to the central mystery.
Without the exact book, it's hard to pin down names, but that's the usual framework for a character-driven story with a name like that.