@IDKWhatUserNameToDo @SwiftSwoobat - If you don't mind my two cents, I think it's a very even match in all honesty. Neither side has quirks that fit very well together. There is Fuyuki vs Himari (Hot vs Cold) and Seo vs Jakob (Animals vs Metal). Considering Fuyuki must make contact with her opponent in order for her quirk to take affect, I would actually make it Fuyuki vs Jakob and Seo vs Himari. For Fuyuki-Jakob, I would have to say Fuyuki would win; the idea being that metal turns hard and brittle when cooled down. So Fuyuki could use that to her advantage, and make Jakob slower or heavier or something by freezing him. On the other hand, it's hard to say what would happen with Himari and Seo. Though, in theory, Himari would leave Seo if she sees that Jakob is in danger (she is lowkey obsessed after all). So Jakob and Himari are at a disadvantage because Jakob is too cold and Himari is too distracted with protecting her loved one. That's just an idea. Let me know if you want something else. I know that I mostly pointed out Himari and Jakob's weak points. But for Seo and Fuyuki, I'd say their weakness is that neither can launch long-distance attacks.
If anyone else needs help deciding please ask. The last thing we need is a last minute mess because nobody wants to lose.