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Hermione is black in the new canon, so she has already covers her quota. Ron was a cuck in the last movies, so he can't be a tranny. Dumbledore covers the gay quota.
Since it's a group with the oppressed card, it must be a positive character. Maybe James Potter? But that'd create a problem about who's is the real father of Harry. I'd say the most likely character to be defined as trannies are Sirius Black or Remus Lupin.