Banana Guy first appears in "Slumber Party Panic," where he dances in the crowd with the other Candy People and plays the Piñata game. In "Ricardio the Heart Guy," he dances with the others as well. In "Mystery Train," he is having noodles in the kitchen as Finn and Jake look for evidence. In "Hug Wolf," he is part of the crowd Jake leads in the search for the Alpha Hug Wolf to get revenge on behalf of Finn.
He appears to be a partially peeled banana with the peeled sections covering his legs. His skin color is orange and he appears to be wearing the banana rather than having it as a part of him, similar to the appearance of Pineapple Guy.