Well, to be honest, I technically don't have an obvious "villain" yet in my story (some would say Alec, but he's more an antagonist depending on your viewpoint.
There is one character, however, that may have a slim chance, not defeating him, but definitely has some secrets. His name is Horace, and that's a huge hint.

Just a lowly avian vet...

Oh, did I mention he likes to fight dirty? 
Not sure it would hurt Quasar, to be honest. More of an annoyance, really.
Probably, 100% would get his butt kicked (technically mortal) but he'd enjoy it after this feeble attempt to embarrass him (I know I would).