The flaming queen, I believe

Teenage Suicide (Don't Do It)

She did a guest spot on Flapjack a couple years back.

David Herman was the Campus Cop, not one of the frat boys. He is also on this show semi-regularly as Mr. Frond, the school guidance counselor. Dana Snyder (who is also the Alchemist on Venture Bros., since no one mentioned that yet) played Pud, Hannibal Burress was Hefty Jeff, and Kurt Braunohler was Turd.