I would also say mentor. (I just wanted to mention how much I love that bonny listed Shredder.)
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Third the mentor thing
Mentor works but I feel like there should be a more specific term along the lines of Sensei.
I like both mentor and sensei.
Was Professor X a mentor? Or did the physical school make him a headmaster?
I'm going to do a workshop and am wondering what to put on my identity patch. SHM-Superhero Mentor.
I'd go with Yoda.
Sire!
I'd go with Yoda.
We are about the same height and I'm sure I could rock that robe.
Spike to Angel: "You were my Yoda, man!"
Hrm, I want to say 'sage' for some reason. I keep on thinking I grabbed that term from monomyth studies, but I can't find a reference to it.
I really like sage.