Hi! This is Squeaky, we were at a game before, yeah? I don't think we interacted much because I can't remember who you played or anything. I'm also the worst, so yeah. Anyway, I now have four characters with varying degree of connection.
First is this girl, Jessica Moran (of the Irish National Team), she is Chaser for the Harpies, so there is a connection through the BIL. She's loud and ridiculous and a bit self-absorbed but generally a good person. She was Gryffindor of '91 so would have overlapped a teensy bit, but probably not enough to have known him in school.
Second is George Weasley (hiseviltwin) who was in the same year as Miles and isn't as 'ZOMG SLYTHERINS ARE EVIL' as I imagine his cannon counterpart was, so he'd be much more friendly, especially given Miles apparently is not a Puritysnob. He probably finds Miles amusing, but there might be a touch of "My jokes are better" going on?
Third is Fleur Delacour (reve_de_moi), who I'm sure has no idea who he is unless they crossed paths during the Tournament, and would probably find him tiring now. Oops.
Finally, as of last night, is Lily Potter (needs_room) who might know him because her son, Harry, is his team-mate. She's well used, by now, to people with ridiculous behavior, so that's fun.