In a way, I would say corpus is quite insular....but then again, so are a lot of the colleges - you tend to form your group of friends within your college. It's just with corpus being so small, it makes this behaviour all the more obvious.
Although of those I've met from corpus, I would have to say they're a friendly bunch. I don't know if they have any informal stereotype attached to them, but I don't think there was anything distinct about them which would allow me to think up one. So it looks like you'll be fine there.