Glitch Sonic (Sonic the Hedgehog 2)

Ashura is a fan name given to a glitched green and black coloring of Sonic in a glitch in Sonic the Hedgehog 2.

The glitch can be made to occur by activating Debug Mode and placing waterfalls in a certain pattern/area.

Ashura is a popular character and is used in various webcomics such as Two Evil Scientists, where he is partnered with Quint, an evil version of Megaman and calls himself "A palette glitch that became too well known."

Ashura, due to being a palette glitch, has no backstory and no given personality whatsoever. This leaves it wide open for fan fiction writers to form his personality and his backstory, another key example of that is Nazo.

How to Unlock
Activate debug mode and select Emerald Hill Zone. When you find an object that is invisible, place it multiple times in these areas and it will show a large waterfall. Each area unlocks a different color palette.

Emerald Hill Zone Act 1 -

Emerald Hill Zone Act 2 - Place multiple large waterfalls on the first "Coconuts" to change into a red, black, and green Ashura.

Trivia

 * When Ashura is hit by an enemy, his legs are blue like Sonic's.
 * When Sonic turns into Ashura, his life icon changes to Ashura's (also due to the palette swap).
 * There is a glitch in the prototype where you can get stuck in the walls.
 * After Ashura loses his Super Form, Sonic's pallete comes back, Due to the fact that his palette after transformation is located within the transformation palette.
 * You can change Ashura's colors like an Ashura with red or orange highlights in his quills, along with blue eyes and a blue outline by moving around after the life icon changes to look like Ashura.
 * After doing the Ashura glitch, almost everything changes color; the animals, the robots, etc.
 * It is unknown who named this glitch Ashura.
 * Ashura is known to have the colors "Green, light green, dark green, red green color, and gold.".
 * Glitches like Ashura and Wechnia (as well as super transformations) seem to be the main reason why Sonic recolours began to exist.