Scruffy

Scruffy is the janitor at Planet Express and is the only person working for Planet Express who isn't a primary character. He reads pornography, and believes in his company, as evident by his purchase of 30,000 more shares of Planet Express than the rest of its employees. The other members of staff only see him occasionally, and rarely recognize him when they do. Sometimes he doesn't recognize them either. Scruffy has indicated that he's been to prison.

Scruffy was originally just a background character seen working various jobs. However writers brought him in on the murder scene of "Anthology of Interest I" because they were running out of non-dead characters. From there his permanent role as the Janitor of Planet Express was cemented when he was brought back in later episodes without changing jobs.

He entered the Panama Wormhole at the end of Into the Wild Green Yonder along with all the other Planet Express crew members, and was killed and then reborn in "Rebirth".

Trivia

 * The first time he appeared, he didn't speak, and his moustache and hat colors were reversed.
 * Scruffy puts cameras up in every room in "Futurama Returns"
 * A comment made by Fry in "The Luck of the Fryrish" ("I didn't reveal the clover's location to anyone. Not even to Scruffy!") suggests that the two may have become close friends. But, at the time, this was more likely to be a pun on the fact that everyone always seem not to know who Scruffy is. However, in The Beast with a Billion Backs Fry is shown to keep two of Scruffy's numbers, vs. one of everyone else's. This seems to extend the joke even further.
 * Before the episode "Anthology of Interest I" when his real job was cemented, Scruffy had different seen jobs not in Planet Express.
 * He had a career at Le Spa.
 * He also worked as a roadie for the Beastie Boys.
 * The Sting suggests he might be Scottish.
 * His hair turned gray prior to (or during) "Anthology of Interest I". The hair and hat colour alternates between old and new during that episode.
 * Scruffy is regularly seen with adult magazines, he reads the articles, such as National Pornographic.
 * Has yet to complete his masters in Theoretical Janitorial Science.
 * Scruffy's character is based on Billy Bob Thorton's character (Karl Childers) in the movie Sling Blade
 * Scruffy was named after a bar in Venice called Scruffy O'Shea's
 * The October page of the 2008 Futurama wall calendar states that his last name is "Scruffington", this may not be canon.
 * Scruffy often refers to himself in the third person when he talks (except when he has to introduce himself, in which case he will say "I'm Scruffy, the janitor".
 * Has both a home and cell phone available to be called on Fry's cell phone in The Beast with a Billion Backs.
 * In Bender's Game, he became a person who apparently cleans up after the Centaurs.