Let's see.. I haveeee:

@"Zinnia Potts" , who is a year younger, but was also a Ravvie, so I'm sure they knew each other. They also probably would have run into each other while she worked at the quill shop, since you know, Hogsmeade small businesses all seem to know each other. I could see them as friendly? Zin is pretty nice lol

Reg is also her age, also a Ravvie, and honestly she would have seen him a lot at the quill shop since he's a reporter and would go through them like crazy. He might be more weirded out by her family (although he might be on friendly terms with Mal since they work together xD), but I'd be down for a weird friendliness, and a potential, awkward hurl haha.

Delilah Warbeck also works at St. Mungo's and would be friendly with her coworkers. Not sure how she'd feel about Enmity, but she'd give being friendly a whirl.