Like I said to Patricia above, Ava really won't be put off by Lucy's blood status. Her bloodist tendencies are all turned inward. She doesn't feel right about judging or mistreating anyone else for not being a pureblood because she's not a pureblood either. She's insecure and self-loathing and confused, but she's not a hypocrite. Her best friend is a halfblood, after all. I think she might appreciate Lucy's sense of humor, but we will have to see!
Yeah, I think it would be good for Jules and Ava to go way back. She's probably going to tag along when he and Ruby study, if that's okay? And, uh, I also just noticed they have five of their six classes together which I swear was a coincidence and not because I am a stalker.
She admires this quality in Tamsin. Perhaps they could sit in silence together sometime.