Hello Steve, welcome! I'm Katie, and I have four here.
Alecto Carrow (5th year Slytherin) is very much the anti-Order and pro-Death Eater, as she will be one in the future! So she'd probably despise Edgar. She's a little crazy and very bratty.
Emily Harper (emharper, 7th year Hufflepuff) is the same year/house as him! She's a future Healer and very much pro-Order, though she wont be a member in the future. She's easily frazzled and very emotional, so he'd probably witnessed her breakdowns in the past seven years, haha. She's a real sweetheart, though, with a big heart, so maybe we can say friends?
Phoebe King (pking, 6th year Gryffindor) is pro-Order, usually in the mix of Marauders/6th year Gryf drama, but is generally a nice girl, a bit of a tomboy, and a Quidditch fanatic. She's a beater for the Gryffindor team and would be friendly!
And last, Amos Diggory (amosed, 6th year Hufflepuff) is a little bit on the pompous side at times, but generally a nice guy. He can come off snobby and like he's bragging a lot, but half the time he doesn't even realize it. He's more neutral, leaning on the side of Good, because half the time he can't be bothered. He's a Chaser for the house Quidditch team and really into his studies.