Demon

The Demon is a minor villain/helper in Teen Titans Go! who appears in the episode Driver's Ed.

Bio
The Demon is a black creature slightly resembling a ram. It is seen being shot with a blast of psychic energy by Raven. Supposedly, Raven was trying to make it go back to the demon world but was interrupted by Robin. It recovered from its fainting from Raven's blast and slithered out of the portal. Later in the episode it is seen eating a seagull and then plays a major role in dragging Ed back with it to the demon world.

Trivia

 * It is still under discussion if it is an ally or an enemy of the Teen Titans. This is because Raven tries to banish it, but it helps the Titans get rid of Ed, but it also eats a number of harmless animals and causes havoc around Jump City.