I'm ridiculously behind, but I figured I would post here for future threads!
I have:

Archer Belby Fellow Ravenclaw first year, so they are dorm mates! He is kind of painfully shy and disaster follows him everywhere, but he has a heart of gold. He also is obsessed with werewolves, ghosts, vampires, etc. He doesn't care about blood status or class and really just wants to make friends.

Fleur Rey is another fellow first year, but she's in Hufflepuff. She's generally very friendly and probably already tried to feed Adrien at some point. She's pretty girly, but maybe they'd be friends.

Thomas Montgomery is a Ravenclaw 4th year. His father is a muggleborn, and his muggle grandparents live with them. He's really into Transfiguration, and he's on the house quidditch team. If they got along, he might be willing to take Adrien under his wing a little. Or he could begrudgingly do it haha

Clementine Rookwood is a 5th year Hufflepuff. She's very much a mom friend sort of person, and she'd stand up for Adrien if he was bullied.