Felicia flip flops. She's always a thief, but often on the side of the angels as a private investigator, security consultant, and will happily throw herself into an adventure if it will bug her Spider. And while she can be an antagonist, it's generally for personal profit or issues, and will turn good again with a little prompting. She only really became straight evil under Slott, which was such a wild character derailment I have to wonder what the hell they were thinking. But the best way to tell what side of the line Felicia is on is by how much cleavage she shows. There's probably a few flaws in this, but it's generally held true that the more skin she has out, the more altruistic and good she is.