Headphones

Headphones labeled The Frenemy is a character recommended by Anko6theAnimator. He was the second booted out of the debut competition and is the one who got Tune's headphones. Later, in episode 12, Headphones decided to be evil and try to win Object Mayhem by possessing Tune, then that's how Tune got evil. As a result, he is most likely a significant antagonist of Object Mayhem, but it also the only indirect antagonist of the show.