Amycus: hand Felix would probably have met at pureblood functions. Felix is very different at those things, much more aloof and proper, so the contrast with him at school would be startling. He grandmother is trying to push him into the DEs, so there could be some plot there?
Antoinette: Felix loves her back! He can't wait to paint her and get involved in cuddles!
Gawain: Felix will try to respect his boundaries, but it'll be hard :) Honestly though he can be a really good listener, so I'm sure that he's picked up on Gawains cues by now, and will do his best not to make him uncomfortable.
Ophelia: an art addict who isn't crazy about pureblood stuff? We need o make these two friends somehow!
Sirius: Felix thinks he's delightful!
Isolde: these two would be like a sugar overdose. I love it.