Headphone Joe is the school janitor. He likes to walk around cleaning while yelling the words of the song he's listening to. He always has his headphones on and cleans tanks by sucking on them.
Headphone Joe is Freshwater High School's janitor that wears a pair of headphones constantly and is never seen without them. He is generally cool and laid back and tries to help students when they have problems. He is mostly seen cleaning the tanks.
When Bea had to wait until Clamantha got out of the yearbook office, Headphone Joe said that she was never coming out of that room. He then sang "Never Coming Out" and left ("Bea Stays in the Picture"). When Milo decided he should go back to the football team, he saw no one but Headphone Joe, who was sucking the football field. He gave Milo advice and told him that the football game was in the gecko tank, which was "burning hot" ("Underwater Boy").
After Oscar noticed that his hair was getting back to his normal hairstyle, he starting talking to himself, saying he would take more of Steve Jackson's hair gel without anyone noticing. After Oscar left, Headphone Joe came, saying he thought Oscar was talking to him ("Hairanoid").