Venusia Crickerly is a year below her in Slytherin; I think they would likely get along (Crick is also very approachable) but not really trust one another?

I have some weird things I figured I'd throw at you, let me know if any strike your fancy! -
Kieran Abernathy covers creatures (including dark ones) for the Prophet if she's into that - he is also very secretly a werewolf
Ivy Sandow is also an Out of Place in Knockturn Alley but intrigued sort
Hey, Juniper, do you want to buy some sketchy potions (abortion, poison, love, whatever?) Noble Greengrass will probably sell one to you.