Butch Magnus Milosevic, known by various nicknames such as Crazy Butch Magnus, One Punch Butch and Bitch Magnus by Riley, is an over-developed 12-year-old boy who is a bully at Riley's school, who first appeared in "Shinin'". He has a severe anger problem, bad manners, a complete disregard for authority, and has a tendency to rob others and ask them for their things afterwards. He was sent to a Catholic school, and a military camp via an episode of the Maury Povich show in attempts to control him but neither worked. He was voiced by Daryl Sabara who played Juni Cortex in the Spy Kids movies.
Butch has a long history of violent tempers and mischievous actions, a blatant disregard for the law, and a tendency to rob others and ask them for their things afterwards, which made everyone grew evidently sick and tired of him. This earned him nicknames like "Crazy Butch Magnus" and "One Punch Butch". He was originally sent to a Catholic school called Jesus, Mary and Joseph Academy for Boys from which he was later expelled for assaulting a nun, and a military camp via an episode of the Maury Povich show which ended in a brutal beatdown of the camp's drill sergeant. All these attempts to control him have met with dismal failure. In Shinin', Butch steals Riley's chain, and Riley has to recover it at great difficulty. He first tried to fight him but failed miserably due to being outsized. He then hired Ed Wuncler III to capture him but Ed accidentally kidnapped the wrong kid. Later, Riley brings along Flonominal to deal with Magnus, only for the latter to turn the tables by breaking Flo's leg with a baseball bat. Butch gives the chain back afterward because his father said it was worthless. He appears in two other episodes, "The Red Ball", in which he is hired by Huey to play against the Chinese kickball team. He is injured like everyone else at one point taking a bombardment of shoes thrown by Chinese fans knocking him unconscious. He also appears in "A Date With the Booty Warrior", in which he is among the trouble making students taken to the prison.
As a local bully, Butch relies on his overwhelming size and physical strength to get what he wants or deal with anyone who crosses him. His ability to knock people out in a single blow earned him a notorious reputation as "One Punch Butch." Because of this, he managed to disarm a nun, headbutt a military-trained drill instructor and swing a chair at a security guard with little effort. In Shinin', he easily defeated Riley in a straight-up fight and broke Flonominal's leg with a baseball bat, both opponents underestimating him completely.