HI James I'm Amy! I have a lot sorry about this long reply.
Nyx Avery - beautylies. She probably won't know or care about Hamish. Probably best for him.
Penelope Clearwater - intensely - Probably doesn't know him being in an older year/house but she'd be nice to him if they spoke. She's my only genuinely nice person with no jaded attitude.
Seamus Finnigan - knightsheir - Is not a bad person but jaded by his job/trying to keep Neville alive. He'd be friendly enough so long as Hamish wasn't a threat to Neville.
Megan Jones - meggies - They were in the same house and obviously should be some sort of friends. She won't care if Hamish is a werewolf or if he turned into a mer-person.
Mary Macdonald - unrighteously - My general motherly-sort. She'd likely not know Hamish unless she knew his parents, which is possible. She's a potion brewer for the crown.
Ernie Macmillan - macmills - Ernie is also a hufflepuff and should be friends with Hamish. He's a bit jaded by life but he's a nice guy in general. Especially to his puff mates.
Draco Malfoy - notoriouss - is not nice to anyone, and will not be sorry about it. Sorry.
Marlene McKinnon - charitas - Another motherly sort but will be quite nice to him. She's a magizoologist so she understands the struggles (from a theoretical/book-based knowledge) and has no judgment on people for their being half creature.
James Potter - stagprongs - His best mate is a werewolf so he probably won't have anything bad to say to Hamish although unless he knows Harry, James likely won't have a lot to say to him.
Callum Vance - blackspaw - Is sirius black's bastard and hates pretty much everyone in that family/in court in general. He'd not hate Hamish, he has nothing against anyone not a Black/Black supporter. But he is also a bit older so may or may know not him.
Bill Weasley - nothingheroic - Loyal to the Queen to a fault. He won't have anything bad to say to Hamish but likely won't interact much with him.