Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.
Maybe. If it has characters like a bumbling dad trying to put up Christmas lights or a kid getting into some silly Christmas - related mishaps, then it would be funny. Christmas is a time when a lot of comical things can happen in family settings, so there's a good chance it has some funny parts.
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