This is a list of characters from the Nickelodeon CGI animated television series, Fanboy and Chum Chum.
The following characters have at least one episode focused on each. They also have appeared in every episode of the series to this point. (The exception being the third)
|Picture||Name||First Appearance (season, episode, time)||Description|
|The main protagonist out of all the characters in the show. He's a fan of everything, has a huge imagination and is always having fun no matter what.|
|The other protagonist along with Fanboy in the show. He is Fanboy's best friend and sidekick.|
The following characters have appeared in several episodes often playing large parts, though sometimes appearing only as cameos. The following characters have appeared in several episodes often playing large parts, though sometimes appearing only as cameos.  The following characters have appeared in several episodes often playing large parts, though sometimes appearing only as cameos.
|Kyle Bloodworth-Thomason||The deuteragonist in the show. He despises Fanboy & Chum Chum because they're not intelligent and annoying to him, but secretly enjoys their company. Known on the show for being the red headed wizard.|
|Lenny Flynn-Boyle||Assistant Manager of the Frosty Mart. He is annoyed at almost anything, but is happy to ride his bike, Bikey. Known to be the most insecure manager in town.|
|Boog Shlizetti||Lenny's employee and the show's main antagonist. Boog is a short-tempered bully who is obsessed with the video game Chimp Chomp which he plays at the Frosty Mart, often instead of working.|
|Oz Harmounian||Owns his own comic book shop, but refuses to sell any of the comics and/or collectibles present there.|
|Yo||One of Fanboy and Chum Chum's classmates. She has an obsessive crush on Chum Chum and wants to play with him so much to Fanboy's annoyance. She also collects yamagutchi digital pets.|
|Hank Mufflin||Fanboy and Chum Chum's grouchy, yet humors teacher.|
|Dollarnator||Robot friend invented by Fanboy in the the future. Usually comes to the present to help the characters in a botch. Is also a time machine.|
|Man-Arctica||The sub-zero superhero liked by everyone. Lives at the Igloo of Ice-olation. Nemisis of Global Warmer.|