Ella is super excited. Overtly excited. Jumping around, ecstatic excited. Felix is one of her two only friends and people she trusts implicitly. She totally clung to him growing up, and maybe sometimes even now depending on her mood, and she's definitely learned to sneak into Hufflepuff to bombard him in his dorm and drag him places. Ella is like the opposite of him when it comes to their father's family not only because they didn't want her when they wrote him, but because when she was a kid she wanted nothing to do with magic and was kinda sad when she got her letter. She loves it now, but yeah, that'd be a no go. If and when she ever finds out she'll be devastated.
Sebastien is his room mate! And he adores him! He adores all his room mates though. :D They might have fooled around in the past because he was all about the free love, but now he's all about Luka.
Remus would probably know him from classes and be nice to him.
Wilhelmina is in his house and year so I would say definitely friends. She probably super appreciates his artistic abilities. She's super friendly and outgoing and she loves Herbology and Quidditch.
Benjy probably doesn't know him? Mundungus might because he knows "the good purebloods" since he's in Slytherin house, but he isn't one. He runs like an underground system for acquiring things that are not strictly legal so if he has any contact with the Dark Arts there's that too. He's also definitely hit on him before because Mundungus hits on every attractive male.
Annnnd lastly is Gilbert. Gilbert is a year below him and Gryffindor, so he might know him by proxy since he's in El's year and house. He might know him through the Guffys as well since his family is mostly Purish and his father takes that very seriously. Gilbert does not which makes for all the tension since he's the oldest boy. Grandma Guffy might've grumbled about it if she's a gossip because he's a trainwreck generally, but especially at formal gatherings. - He's similar to Felix in that he doesn't quite grasp the concept of personal space and doesn't always pick up on social cues. He's super nice and friendly and outgoing, but that sometimes translates into annoying. He's really smart and sometimes rambles on about random things but he hopes that's endearing. Also- note: he's super clumsy. Like trips over his own feet. So yeah. ;] EITHER WAY, I think they'll get along? He also identifies as Bi so there's another bonding point.