He calls himself a goblin waiting to steal gold. He can be seen in detention and perched above the News Office. In South Park: The Stick of Truth, his name is given as Leroy Mullens, combining his original and later names.In ' T.M.I.', he was listed by the school as Leroy Jenkins, a reference to the famous internet meme featuring a World of Warcraft character of the same name.Despite these characteristics, it appears that the girls of South Park Elementary like him, as they ranked him sixth on the real attractiveness list.
His most impactful contribution to the show is his presentation on 'murder porn' in ' Informative Murder Porn', where he convinces the student body that it was a bad thing. He has interests that are seen as odd to others, displays a high sense of intelligence, and is socially awkward. Peter Mullen is seen as a stereotypical geek/nerd. Peter and his frog in ' Mystery of the Urinal Deuce'.