Hi! I have two sixth years who could've been of some help had they not been in Ilvermorny(I assume Caspian is not, being a first year and all, or maybe? I dunno) but depending on what could happen there's:
Hitame Mulciber - Her real name's Anabelle but she has this thing for the Japanese culture and her aunt's husband gave her the nickname Hitame and it stuck, so that's what she's called. She's a Gryffindor, a Pureblood, and a family outcast because she loves muggle things and it just vastly different from other family members.
Then I have Evander Yaxley, a Ravenclaw and the Nobody twin of his brother Cronis(who I will also probably play lol). Evan is kind and down to earth, but has his moments just like everyone else.
The rest of my characters are Grads but I'll list them anyways in case anyone spikes your interest.
Kaiden Poliakoff - Slytherin grad, twenty, has amnesia.
Ryo Hiroku - Hufflepuff grad, twenty-five, Spirit Specialist, Owner of Eyelops Owl Emporium, Vampire.
Rose Granger-Weasley - Ravenclaw grad, twenty-three, Assistant Director at St. Mungo's.
Out of the three of them, I'd say Caspian would probably have met Ryo because he'd need to go shopping for his things in Diagon Alley, and one of the things he will need is a pet. Since Ryo owns the pet shop, Cas would've had to go in at some point.