Ideas for mentors?

So I've been fan fiction for my three Young Justice OCs a lot as of late. As I've progressed, I've been thinking that eventually each of them should get a mentor from the league. My only problem? I have utterly no idea who to use for any of them? ^^; I don't really want to use Batman or Aquamqn or anyone because they obviously already are mentoring a young hero.

So my question is who do you think the most appropriate mentor would be for each of my characters based on their powers? (I'll list both characters and powers below)

Mila Anderson AKA Pyre: the ability to conjure and manipulate flame (I was kind of thinking Fire for her mentor, but I don't know very much about her character and would have to do a little more research before deciding)

Finley 'Fin' McGuire: Moderate super strength and accelerated healing.

Leath Justins: telekinetics and the ability to cast illusions on the people around him.

Any suggestions would be greatly appreciated (: thanks!