Sayuri x Kanako - Same year, so they share a dorm so we could probably develop a backstory there if you want (despite the snubbing of night one lol) or have some sort of inciting incident that gets them interacting. Kanako isn't the easiest to get along with, but she kind of has no friends and isn't above pretending to be a better person than she is to get some lol. Kanako loves quidditch too but it's new to her, due to being raised by a solo muggle father. They're both Japanese too, so they might find some sort of refuge in each other outside of their families (Kanako doesn't really get along with her brother). There's options, let me know if anything vibes right with you.