Arrowinmyknee
Well most likely people you are not forgetting this is a collab with marvel world and we nice female leads in marvel like Skye,natasha,Sif,Hope pym,Wanda, maria hill because our MC is analytical and calculative with his approach that kind individually may feel appealing to her. Take your pick. Even if he wants a relationship in wizarding world I always like older woman Nymphodora tonks is just couple years older than him I would like to see if they can get in a relationship.
it's kinda hard to imagine the mc in any relationship since he has no charecter. This story is interesting but the mc has no personality at all. no likes, dislikes, no expressed feelings what so ever. Someone like Mione or Luna just dont make sense. they are too bland, innocent and young. imagine how boring the couple would be. In order to create a pairing the mc needs to be matched with someone with a strong, forcefully (flirty?) personality cos the mc just doesnt have the charecter (currently) for it. needs some development imo. With the mental limitations, It was a good time to slow the story down and focus on some charecter building and development.
You really need to work on your dialogue. All the conversations in this chapter felt unnatural. Descriptions aren't bad though there are a bunch of redundancies. Also the massive plot hole of him somehow not noticing marvel need to be closed like dozens of chapters ago. But I'm sure you know that but realized it would be hard to fix at this point.