Nathan is an unpopular, handicapped fourth grader with Down's Syndrome who is forced to go to the Lake Tardicaca Summer Camp with other handicapped children every year because his two-faced and abusive parents force him so they can go on luxurious trips, such as to Italy, while pretending they can't understand what he's saying. His team has lost every activity at summer camp for years to the Blue Team, lead by Jimmy Valmer, Nathan's sworn enemy. He also worked on the side as a steroid dealer during the Special Olympics, and Jimmy was one of his customers.
He pretends to be extremely mentally handicapped and harmless around adults like his mother and camp counselers ("I like to go to sleep at night-time!") and even feigns friendship with his rivals, but when alone with his best friend and henchman Mimsy and other kids displays sadistic tendencies, attempting to kill both Jimmy and Timmy Burch in separate instances. Nonetheless, Nathan's plans almost always backfire one way or another, almost as often from his own error as those of his assistant, and he has been traumatically raped at least three times, twice by a freshwater Lake Tardicaca Shark.
He teamed up with Princess Kenny and Stan Marsh in favor of the PlayStation 4 - surprisingly enough, the same system of choice as Jimmy Valmer. Any attempts to sabotage the Xbox One team remains undocumented.
- "Shut up MIMSY!!"
- "I can't stand him, Mimsy. That Jimmy kid makes my fuckin... skin crawl." (Crippled Summer)
- "Uh, my name is Nathan. I'm disabled." (Crippled Summer)
- "I'm sick and tired of your stupidity, Mimsy! You are the biggest idiot I have ever met! And from now on, if I wanna do something, I'm gonna do it myself!" (Crippled Summer)
- "I hate you, Jimmy. I fucking hate you with everything in my entire being. " (Crippled Summer)
- "We hate camp, Mimsy. The singing, the competitions, Jimmy Valmer getting all the chicks. " (Handicar)
- "Let me give you guys a hot news flash: If you want to hurt a crippled kid, you don't break his FUCKING LEGS!!" (Handicar)
- "Let me ask you a question. Do you want to see my dick?" (Handicar)
- "This is very difficult, Mom. But um... You know how every year I go to summer camp? Well, I hate it. I hate it and I don't want to go anymore. " (Handicar)
- "Now listen, everybody. If you're a sheepherder, and there's a snake taking away your sheep, what do you do to the snake? " (Handicar)
- "If you're a sheepherder and a snake is killing your sheep, you just need to have the snake get sued for sexual misconduct."
- "If you're a sheepherder, and a snake is killing your sheep, all you have to do is prove to the sheep that the snake is a completely inferior entity."
- Up the Down Steroid (s08e03)
- 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 Mimsy - their friend icons are in the game's files - but their role is unknown.
- He bares a strong resemblance to cult comedian Mitch Hedburg, who died in 2005.
- Unlike most South Park characters, Nathan's head is seen primarily from the sides and only briefly may look directly forward.
- He and Mimsy are both homages to the Looney Tunes cartoon characters Rockys and Mugsy; a poster for the two appears in his bedroom in "Handicar".