Shadow the Hedgehog
Shadow the Hedgehog (シャドウ・ザ・ヘッジホッグ, Shadō za Hejjihoggu) is a character from the Sonic the Hedgehog series who, like Knuckles, is a rival of Sonic. He is a hedgehog known as the "Ultimate Lifeform." He has his own game that mainly features him, the self-titled Shadow the Hedgehog, which was released in 2005 for all three sixth-generation consoles (except the Sega Dreamcast, which was discontinued before Shadow the Hedgehog was planned). Since his debut, he consistently holds second place as the most popular character in the franchise, trailing the eponymous character. Unlike his heroic counterpart, Shadow is a much darker and developed character, willing to do whatever it takes to reach his goals. However, in the recent games, he has become a somewhat lighter, anti-hero character.
Shadow the Hedgehog first appeared in Sonic Adventure 2 as one of the main antagonists and has appeared in numerous Sonic games since. He is Sonic's arch rival, but they have become allies in certain occasions. In Sonic Adventure 2, Chaos Control was used as a form of teleportation that makes Shadow move through space at an incredible speed. In two player mode, Chaos Control stopped time and "froze" the opponent while Shadow moved at normal speed. Chaos Control was also used to slow down time in Sonic Heroes, and when fighting against a boss in Shadow the Hedgehog. Chaos Control can only be performed when Shadow is within the proximity of a Chaos Emerald. In Brawl, Shadow appears as an Assist Trophy and uses Chaos Control to slow down time for opponents, but not for the person who summoned him.
 In Super Smash Bros. Brawl
Shadow appears as an unlockable Assist Trophy character in Brawl and uses his "Chaos Control" ability to slow down everyone except the summoner (similar to the effects of the Timer item, though with a shorter duration, and without the risk of it backfiring). Shadow the Hedgehog is unlocked when the player unlocks Sonic as a playable character. He also appears as a regular Trophy.
In Brawl, Shadow the Hedgehog is voiced by Jason Griffith (who also voices Sonic) in the English version of the game, and Kouji Yusa in the Japanese version.
Shadow The Hedgehog is a black hedgehog who resembles Sonic. He was created by Dr. Eggman's grandfather, Gerald Robotnik, to be the ultimate life-form. Not only does he look like Sonic, but he has equal abilities. He has great skill with the space-time warping technique called Chaos Control. To reach his goals, he'll use any means necessary.