Virtual Hedgehog

Robo-Sonics are robotic versions of Sonic that were created by Doctor Eggman in Sonic Colors. They look exactly like Sonic but come in a variety of different colors and other features. They are playable in Sonic Simulator.

Attire
(These are the differences between the looks of the Robo-Sonics and Sonic, accordingly)

Robo-Sonics look exactly like Sonic but come in a variety of different colors. They have a red antenna sticking out of their heads, they also have no pupils on their irises, and have their eyes glowing according to their color (depends on the color). They also have a circular light on each hand and their chest (that too depends on the color). There is a white cuff around their neck. Also, instead of Sonic's white folded cuffs, they have a gray metal ring on their ankles and wrists.

The color of the eyes and the "bulbs" they have on their hands vary; it depends on the color of the robot:

Blue Robo-Sonic: Cyan eyes and bulbs.

Red Robo-Sonic: Yellow eyes and bulbs.

Pink Robo-Sonic: Purple eyes and bulbs

Green Robo Sonic: Orange eyes and bulbs

Black Robo Sonic: Light Blue eyes and bulbs

Development
Robo-Sonics were first leaked by Amazon in August 2010. They were leaked with one certain screenshot, but later that day the image had been removed as it was leaked.

Later on 2 September, 2010 IGN had revealed them along with the information that they would be playable in Sonic Colors, but only in the co-op (Though later they're confirmed to be also playable Solo while having to switch characters at anytime whenever they please.).

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Trivia

 * They are very similar to the colorful Sonic robots that appeared in the Sonic X comic Issue 25.
 * The glowing red antennae on their heads are similar to the orb on the Tails Doll.
 * Robo-Sonics are analogous to Shadow Androids.
 * While highlighting Robo-Sonic Players can change the Color of Robo-Sonic to colors like Pink, Green, & Black by pressing X, Y, or R/Z Buttons(According to the Gamecube/Classic Controller); C, Z, 2 or + button on the Wiimote + Nunchuk configuration (Respectively, C=Green, Z=Pink, 1=Black and +=Blue).
 * These robots look the most identical to Sonic.
 * These robots collect the Chaos Emeralds, although when they collect them, Sonic the Hedgehog really gets the Emeralds.
 * The Robo-Sonics are able to imitate Sonic's voice perfectly in gameplay.