Anna Cornick (omegawolf) and Wanda Maximoff (thescarletwitch) both immediately said it's okay to hide out and be quiet and they'd be willing to sit quietly with him -- and let him info dump about plants.
TJ wants to flirt and I'm sort of like "what else is new, my dude" and he'll probably drag Neville out for socializing.
Caleb is mostly just curious about the HP people and their variations of magic. Skye might wind up dropping prehistoric plant knowledge on him and that'll be fun. No idea how the other three feel yet beyond Birkhoff's general nerding out over HP characters being real.