Goon is the older brother of Dana who appeared in the episode "Oh, Brother". He keeps saying "Yo" and it is revealed at the end of the episode that he was actually speaking to his sister, whose full name is Yodana. Ever since now, Mrs. Jewls has been trying to catch him for not finishing a homework assignment.
Goon has brown hair tied in a ponytail and wears glasses. He has a nose similar to Dana's with his mouth resting directly under it. On his chin, a little bit of stubble can be seen. He wears a large jacket with a blue shirt seen underneath. He often wears a pair of blue jeans and large black boots. At the end of the episode, it is revealed that Goon is actually fairly skinny, and the jacket only makes him appear larger.
For some reason, the iTunes version of "Oh, Brother", said that his name was Boris, this is unknown why this was in the description.