Here’s a great list of potentially villianous traits for an antagonist. And, despite the examples, they don’t have to be female. Will your protagonist take the advice and ditch the “toxic friend”?
7 Types Of Toxic Friends You Need To Ditch.
http://m.huffpost.com/us/entry/7366026?ir=Women&ncid=fcbklnkushpmg00000046
sharon p. lynn 