Slim is a fictional character in the Mario series and the fourth of the many Pixl that Mario, Peach, Bowser, and Luigi discover in the Wii video game Super Paper Mario. He joins the party at Merlee's Mansion. His special ability is to allow Mario to become very thin, letting him have access to previously inaccessible areas. An example of this would be if he wanted to get between two rails. Also if the player stands still using his ability, the player will become invisible and untouchable by enemies, making Slim quite useful in boss battles. It is impossible to use his ability while the player is changing dimensions, but Mario can use it while he is in 3-D. Like Grubba, Slim acts like an American Southerner.
- His ability is a nod to the Paper Mode curse in Paper Mario: The Thousand-Year Door.
- He got the name "Slim" because he makes Mario and the other heroes slim.
- His power is somewhat similar to Vivian and Lady Bow.
- There is a resident living in Flopside called Slim. After the player wins the game, he takes a liking to Nastasia.