Shadow the Hedgehog

Shadow the Hedgehog is an anti hero and the arch rival of Sonic the Hedgehog. Created as "The Ultimate Life Form" by Professor Gerald Robotnik. Shadow is indestructible, however that doesn't mean that he does not feel pain. Shadow is ageless as well. On April 22, 2006, Mecha Sonic begins to search for the Chaos Emeralds while killing anyone who gets in his way, starting with Sonic's friends. The robotic tyrant kills Tails, Amy, Knuckles, Cream, Cheese, Rouge, and E-123 Omega. Shadow mourns Rouge and Omega, before going after Mecha Sonic. Just before Mecha Sonic can transform into his complete form with the Chaos Emeralds, Shadow arrives and uses Chaos Control to teleport the Emeralds to another dimension, and away from the villain's reach. Mecha Sonic, however, uses Chaos Control to teleport to the dimension where the Emeralds are. Since then, Shadow and Sonic find the remains of Dr. Eggman's crashed Death Egg, with the main control room still completey intact. They built a capsule that could teleport them to the dimension where Mecha Sonic and the Chaos Emeralds are: the Mushroom Kingdom. They teleported there, and unexpectedly landed on top of Bowser in his metal form, thus saving Mario's life. Mario defeated Bowser once again, and teams up with the two hedgehogs in aid of their mission.

Appearances

 * Sonic Adventure 2 
 * Sonic Adventure 2: Battle
 * Sonic Heroes
 * Sonic Battle
 * Shadow the Hedgehog
 * Sonic Rivals
 * Sonic Rivals 2
 * Sonic Riders 
 * Sonic Riders: Zero Gravity 
 * Sonic the Hedgehog (2006)
 * Sonic and the Secret Rings 
 * Sonic Chronicles: The Dark Brotherhood
 * Sonic & the Black Knight
 * Mario and Sonic at the Olympic Games
 * Sega Superstars Tennis 
 * Mario and Sonic at the Olympic Winter Games
 * Sonic and Sega All-Stars Racing
 * Super Mario Bros. Z Episode 2: Warriors from Another Dimension
 * Super Mario Bros. Z Episode 3: The New Threat
 * Super Mario Bros. Z Episode 4: Here Come the Koopa Bros.
 * Super Mario Bros. Z Episode 5: Troubles on Yoshi's Island
 * Super Mario Bros. Z Episode 6: Brawl on a Vanishing Island
 * Super Mario Bros. Z Episode 7: Secret of the Pipe Maze
 * Super Mario Bros. Z Episode 8: The Great Doomship Offensive
 * The Ultimate Battle

Non-canon appearances

 * Super Smash Bros. Brawl 
 * Super Smash Bros. Unleashed