I want to know this as well. For once, we can safely guess by some known interactions and dialogues that the way Ayua acts towards or around Nika is affected by Bella/Nika relationship, but I don't know how:Question, but does Ayua ever interact with MC if you are not on Bella path?
A) Ayua is (touchy, blunt, direct) if Bella and Nika have nothing to do with each other.
B) Ayua is (touchy, blunt, direct) if ONLY Bella likes Nika, and they obviously didn't kiss each other.
Does Nika still somehow get invited to train? How's their interaction at the college's bar? Does Ayua still jokes about getting married to Nika so he can learn her family martial arts?
I know I could just play it myself and find out, but I honestly find it a bit difficult to replay games from the beginning with a certain path I'm not very attached to (in this case being non-Bella/Nami/Vic).