Hmmm yes, the Slytherin house did something like this last term. Voluntarily of course. There was a thread in which people described their character (name, year, likes, dislikes...), and then younger students (or new students in general) were paired off with older (or returning) students.

It was mostly like how Kinzey described it. Older (or returning) students were pretty much the big brother or sister. Helped out with homework, questions, made their little buddy feel at home...It was also a good way for the new people who join the site to get into the flow of RPing and they'd have someone there to RP with.

It's a nice idea in my opinion.

I'm so sorry if I got your name wrong. *flail*