Doesn't only have to be a "mentor" but can also be a father figure as well. Anything encompassing a bit of drama, thriller, preferably little to no romance.
Character dynamics in TV shows/Movies that resemble this:
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Andrew and Fletcher from Whiplash
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Kendal Roy and Logan Roy from Succession
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Nina Sayers and Thomas Leroy from Black Swan
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Jesse Pinkman and Walter White from Breaking Bad
by Cheesecakelad