Stan Marsh

 "Dude, sometimes I think our parents are really stupid"

Stan Marsh is the lead main character in "South Park".

Personality
Stan is probably the most relatable of the four boys. He has a deadpan sense of humour and frequently finds himself frustrated with the stupidity of his father and the general adult population. Several episodes show him learning how the adult world works and about 90% of the time he winds up walking away in total disbelief of said adult's inane logic.

Stan has a fondness for most animals, especially whales and dolphins. He was willing to give up eating meat after finding out that veal was made from tortured calves.

Stan has had a long-running crush on Wendy Testaburger. He had an unfortunate habit of throwing up whenever she talked to him. Stan usually takes on more daring persuits just to impress her, most notably in the South Park movie where he helped form an organisation dedicated to saving Terrence and Phillip. When Wendy broke up with him, Stan was nearly suicidal and decided to hang out with the Goth Kids. This phase predictably ended after one episode when Stan realised that his life was revolving around Wendy too much anyway. After several seasons of giving her the cold shoulder, Stan teams up with Wendy to uncover a conspiracy among the girls. This is enough for them to rekindle their romance and they become a steady couple.

When Stan turned 10, he began to notice some startling changes. Everything he used to like now looked, sounded or tasted like crap. He couldn't even listen to someone talking without picturing feces spewing from their mouths. The other boys decide that Stan's become a buzzkill and stop hanging out with him. Stan gets depressed from all of this and Mr. Mackey mistakenly thinks he has Aspergers' Syndrome. Stan is then admitted to a clinic where he finds out that Aspergers'is just a cover for people who see things as he does. It turns out that in order to go back to the way things were, Stan has to start drinking. It is implied that Stan drinks off-screen in order to function and may even be an alcoholic.