Who is your favorite character to rp of yours, Dean?
College is going to eat up a lot of your time, but you will find breaks. If the leave is only temporary I would suggest keeping at least one of your characters to rp. When you return, if you crave rp, you'll have to make a brand new character(unless you only plan to use Hestia) before hand, and that wastes time. This is just my opinion but I think you should keep at least one of your demigods. I mean, there's no point in wasting them. If you really wanna clean your slate I'll take one of 'em and hold onto him/her as an inactive in case you do find you miss them. Or better yet you can just make your characters inactive, so then you'll at least have the information saved should you ever want it again.
On another note, good luck in college! Keep off the jungle juice. ;D