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Captain Charles T. "Chuck" Baker
Voiced by: Dwayne "The Rock" Johnson
Chuck is a 50-year-old human astronaut who gets stranded on Planet 51.
- The Big Guy: He is the biggest main character in the movie.
- Decoy Protagonist: He is first billed in the opening credits and top-billed on the DVD cover, but the real protagonist is Lem.
- Humans Are Ugly: Chuck is quite handsome and has had his likeness posted on many Earth magazines. However, by Planet 51 standards, he's hideously ugly and is assumed to be a threat because of this.
- Token Human: He's the only human character in the entire film. There is no sight of Earth nor any other humans besides him.
Lem
Voiced by: Justin Long
Lem is a 13-year-old who works in the planetarium. When he first meets Chuck, he agrees to help him stop his spaceship. When Chuck is captured by Kipple, he leads a group of friends on a rescue mission to save him and help them stop the ship.
- All of the Other Reindeer: This is justified since he was a Attention Whore.
- Big, Thin, Short Trio: The thin to Skiff's big and Eckle's short.
- Butt-Monkey: He is clumsy, but cheerful.
- Cloudcuckoolander: He is ditzy and sometimes forgetful.
Neera
Voiced by: Jessica Biel
Lem's 15-year-old neighbor and crush, which she actually reciprocates.
- Beauty Brainsand Brawn: The beauty to Skiff's brawn and Eckle's brains.
- Green-Skinned Space Babe
- Nice Girl: She's one of the few residents of Planet 51 who doesn't believe Chuck to be evil and doesn't require much motivation to help rescue him during the climax.
General Grawl
Voiced by: Gary Oldman
General Grawl is a 69-year-old general who relentlessly pursues Chuck.
- Anti-Villain: While he's relentless in his pursuit of Chuck, it's because he's under the mistaken belief that he poses a danger to his planet. Once he relizes that Chuck isn't dangerous, he orders his men to stand down and parts with Chuck on friendly terms.
- Big Bad: He is falsely the main antagonist of the film and Kipple working for him is all part of his Evil Plan.
- Big Bad Duumvirate: With Kipple.
- The Dragon: To Kipple.
- Laughably Evil: Of the Comically Serious variety.
Skiff
Voiced by: Seann William Scott
Skiff is the 14-year-old best friend to Lem and a friend of Eckle's.
- Big Damn Heroes: He and Eckle save Lem from being abducted by Chuck, whom they mistake as the alien.
- Big, Thin, Short Trio: The big to Lem's thin and Eckle's short.
- Butt-Monkey: When he is disturbed by Rover.
- Cloud Cuckoo Lander: He's the cookiest of Lem's friends and is constantly making conspiracy theories about alien invasion.
- Deadpan Snarker: Has a few moments around Rover.
- The Lancer: To Lem.
- Those Two Guys: With Eckle.
Eckle
Voiced by: Freddie Benedict
Eckle is Neera's 8-year-old brother who speaks in a British accent.
- Big, Thin, Short Trio: The short to Lem's thin and Skiff's big.
- Big Damn Heroes: He and Skiff save Lem from being abducted by Chuck, whom they mistake as the alien.
- Keet: Always bursting around with energy.
- The Napoleon: He joins the final battle with his Big Guy antics.
- Never Bareheaded: He always wears a red baseball cap, backwards.
- Those Two Guys: With Skiff.
Professor Kipple
Voiced by: John Cleese
Professor Kipple is an 80-year-old scientist who helps General Grawl to get rid of Chuck's brain. He is Grawl's henchman. At The Stinger, he is revealed to be the Big Bad of the movie.
- Badass Bookworm: He is smart, but evil.
- Big Bad: He is the main antagonist of the movie.
- Big Bad Duumvirate: With Grawl.
- The Dragon: To Grawl... or so it seems. It's revealed that he accepts Grawl's help as part of his evil plan.
- Evil Chancellor: He is the main henchman to General Grawl.
- Evil Laugh: He has one at the climax of the movie when he prepated to take Chuck's brain out of his head.
- The Napoleon: He is four feet tall and has quite a bad temper.
- What Happened to the Mouse?: He was last seen during the final battle getting presumedly killed by Lem. He reappears in the post-credits scene, having survived and is revealed to be the true Big Bad of the movie.
