This mentally handicapped boy is Nathan's best friend and his main henchman against Timmy Burch and Jimmy Valmer. Mimsy may seem stupid at first glance, often misunderstanding Nathan's orders and causing plans to backfire, but he has had moments of clarity and intelligence as well, only to be silenced by Nathan. He is very subservient to him, calling him "boss", taking - and even inflicting upon himself - physical abuse, and following him around whenever called. Though he generally seems far kinder than his 'boss', he often displays sadism by becoming extremely excited at the prospect of murdering Timmy and Jimmy, risking exposing their plans unless Nathan shuts him up. He also found great humor in Nathan being traumatized and raped by a shark.
He, too, sided with Princess Kenny and the PlayStation 4 Army on Black Friday, but like his co-hort, played no known role in the proceedings.
- "Sorry, boss."
- "D'oooh boy!"
- "Duhh you always hated Jimmy, boss. Ever since he whooped you at soifin' last summer camp, he really took it to you good, haha." (Crippled Summer)
- "Oh boy, we're gonna ruin Blue Team's chances, huh? We're gonna break their legs or somethin', boss? " (Crippled Summer)
- "Aww, dah, jee whiz boss, we're gonna kill all the Blue Team and Jimmy, huh?" (Crippled Summer)
- "Dahhh I've got it boss. I blow the whistle and make the shark come and bite Jimmy's legs off. Then he bleeds to death! He's gonna bleed to death!" (Crippled Summer)
- "Dahhh I got me a shark whistle. " (Crippled Summer)
- "D'oh yeah, and don't forget last year at sumemr camp, you got raped by a shark!" (Handicar)
- "Hey I got an idea! Why don't you guys just make your cars cleaner and nicer, and try to be better to your customers so that you can compete with Handicar's popularity in the marketplace?" ((Handicar))
- "D'uh maybe if they're that incompetent we shouldn't be tryin' to save their jobs. Maybe Handicar is a kind of economic natural selection, where the more diligent workers are weeking out the useless ones. Drrrrr." ((Handicar))
- "D'ahhh, you sound like that Matthew McConaughey guy. "Ah I drove a Lincoln before I got paid to drive one. Drrrr."" (Handicar)
- "D'ah hey boss, it seems like every time you come up with a plan it kind of backfires on ya. If you really don't wanna go to summer camp so bad, why don't you just tell your parents how you feel? You know, tell 'em you don't wanna go and just see how they react. Wait wait, I got it... (smacks himself) Shut up, Mimsy!" (Handicar)
- Crippled Summer (s14e07)
- Black Friday (s17e07)
- A Song of Ass and Fire (s17e08; cameo)
- Titties and Dragons (s17e09; cameo)
- Handicar (s18e04)
He was originally slated for a role in the game with Nathan - their friend icons are in the game's files - but their role is unknown.
- He and Nathan are homages to the Looney Tunes characters Rocksy and Mugsy.