List of cameos in Wreck-It Ralph

Focused around video game characters, Wreck-It Ralph features numerous video game characters from multiple publishing companies alongside the film's cast of original characters, much like the 1988 film Who Framed Roger Rabbit.

Disney

 * Tiny the T.Rex from Meet the Robinsons

Nintendo
(Note: Mario and Luigi, the protagonists of Super Mario Bros. were intended to have appeared in the film, voiced by Charles Martinet. However, the producers couldn't find a place to work them into the story, that felt right for their significance, along with paying a hefty licensing fee. However, Mario is mentioned by Fix-It Felix in the film.)
 * Bowser from Super Mario Bros.
 * A Super Mushroom from Super Mario Bros.
 * Princess Daisy from Super Mario Bros.
 * Rosalina from Super Mario Galaxy

Sega

 * Sonic the Hedgehog from Sonic the Hedgehog
 * Miles "Tails" Prower from Sonic the Hedgehog (Picture on a wall in Tapper's Bar)
 * Dr. Robotnik (Eggman) from Sonic the Hedgehog
 * Neff from Altered Beast
 * Cyril the Zombie from House of the Dead
 * AiAi from Super Monkey Ball
 * Cyborg from Cyborg Justice
 * Mishaela from Shining Force

Capcom

 * M. Bison (Vega) from Street Fighter II


 * Zangief from Street Fighter II


 * Chun-Li from Street Fighter II


 * Cammy from Super Street Fighter II


 * Ken from Street Fighter


 * Ryu from Street Fighter
 * Blanka from Street Fighter
 * Beholder from Eye of the Beholder

(Note: Dr. Wily from Mega Man was originally set to make an appearance in the Bad-Anon villains support group, however he was cut in the final version of the film.)

Midway

 * Kano from Mortal Kombat


 * Smoke from Mortal Kombat


 * Paperboy from Paperboy
 * Bartender from Tapper

Namco

 * Clyde from Pac-Man
 * Pac-Man from Pac-Man
 * Inky Ghost Monster from Pac-Man
 * Blinky Ghost Monster from Pac-Man
 * Pinky Ghost Monster from Pac-Man
 * Dig Dug from Dig Dug
 * A Pooka from Dig Dug
 * A Fygar from Dig Dug

Gottlieb

 * Q*bert from Q*bert


 * Coily from Q*bert


 * Slick from Q*bert


 * Ugg from Q*bert

Konami

 * Frogger from Frogger
 * Yuni from Dance Dance Revolution
 * An Exclamation mark from Metal Gear

Atari

 * Paddle 1 and Paddle 2 from Pong
 * A racer from RoadBlasters

Taito

 * An alien from Space Invaders (on a picture)
 * The Qix from Qix

Data East

 * Peter Pepper from BurgerTime

Williams Electronics

 * Knight and Ostrich from Joust