Mr. Slave was Herbert Garrison's long-time teaching assistant (or "teacher's ass" for short). He loves sadomasochism and he's not afraid to shove things up his ass -- whether it be the class gerbil Lemmiwinks or Paris Hilton. And he's always around to dispense knowledge of his whorecapades to the children. Mr. Slave broke off his relationship with Garrison after Garrison's "vaginoplasty" sex change operation. And shortly after gay marriage was legalized, he got hitched to Big Gay Al in a glorious white wedding.