Romper Stomper was Eric Cartman's cell-mate at the Alamosa Maximum Security Juvenile Hall, so named for the Hasbro toy Romper Stompers he always used. He wanted cigarettes and would tell Cartman retrieve them, when Stan Marsh and Kyle Broflovski visited. Even more desperate was his desire to see Disneyland. He seems to have a love for movies, seen when Cartman and Romper Stomper attempted to escape. During the escape, Romper Stomper told Cartman to escape on without him.
Cartman obliges and continues to leave, until the security guards catch up to the two. The guards let Cartman go free, due to him being pardoned, however, Romper Stomper was to return to the facility. Cartman later visits Romper Stomper, with the whole of Disneyland hidden in his rectum, allowing Romper finally see it.
Romper Stomper has messy black hair, a teardrop tattoo, and with two other tattoos on his arms. He wears an orange prison suit, black shoes and is taller than a 4th grader, he looks the same size as Shelly Marsh.
Romper Stomper's appearance has changed a bit in South Park: The Stick of Truth, he's designed more like a 4th grader, but still the same size, he no longer uses his yellow cups and his tattoo is different too.
He is shown to be a bit dramatic. Romper Stomper is also shown to feel sympathy for people when they cry. This is evident when Cartman cries, after learning that Romper Stomper lied about helping him escape.
- Romper Stomper can be seen using Romper Stompers, the two yellow cups strapped to the bottom of his shoes, a toy made popular in the 1970s. 
- Romper Stomper's character is likely based on Hondo's character in the film, Romper Stomper, a film about hate crimes.
- Romper Stomper appears in South Park: The Stick of Truth in the South Park Police Department jail cell. He gives the player a quest to get the key to break him out. His voice sounds higher than on the show.