Hey Ren! My name's Alison and I have two here so far, Barney Dunstan accio_barney and Demelza 'Mel' Robins. Barney is incredibly energetic, talkative, sweet, and stupid. He will be nice to Orsino because he is literally nice to everyone. He's a 6th year Hufflepuff and is the Hufflepuff keeper in normal years. I imagine they could be friendly, at least as much as people in different houses and years can be.
Mel is my super-opinionated feminist, Gryffindor 5th year. She loves debating and Quidditch and cute boys. I bet she'll have opinions about music as well, you know. Possibly an ex-girlfriend if he'd go for someone two years below? She's pretty and fun but can't hold onto guys for very long because she debates them to death.