Dark Mario

"It is I, Dark Mario, your Cosmic Clone and your dark side..."

- Dark Mario

Dark Mario, who is actually Cosmic Mario, is the dark and evil version of Mario. His physical shape is identical to Mario, but he had his outer appearance is blue with stars all over since Super Mario Galaxy, as if he were made out of cosmic matter. Since his recent appearance in Super Mario 3D Land, he has a purple outline instead, with yellow eyes similar to that of Cosmic Clones from Super Mario Galaxy 2. He is set to reappear in Super Mario Bros. X: Sea Side Adventure as Dark Mario and an powerful entity that Mario had to face.

The Cosmic People's Invasion
Ever since Mario's adventures to travel in the outer space, Cosmic Mario with Cosmic Luigi continue to hunt the Mario Bros., but had been defeated by both Mario and Luigi in the end. After the defeat of the Cosmic brothers, both of them with the Cosmic Clones went to invade the Galaxies, but managed to encounter the Shroobs. The Cosmic characters had all been annihilated during the war.

Rebirth of the Cosmic Clones
Prior the events of Super Mario Bros. X: Sea Side Adventure, Cosmic Mario managed to be reborn as Dark Mario within Mario's soul.

Biography
Reborn as a being of pure darkness, Dark Mario represents the dark side of Mario. However, he was still too weak and was in his standart form. Yet, Dark Mario was still the source of Mario's fear and depression, worrying that his dark side would take over him and swallow him. As the story keeps continuing, Dark Mario has become a manifestation of Mario's very spiritual power, meaning Mario's powers also draw strength from him. He keeps getting stronger and stronger, and Mario's strength began to weaken, despite that Mario keeps trying to get even more stronger.

Trivia

 * The developers of Super Mario Bros. X: Sea Side Adventure have expect Dark Mario to have every same abilities Mario has, but which are more improved.
 * Dark Mario is able to transform into the same alternate forms of Mario, but at will without the helps of the Power-Ups.
 * It is confirmed that Dark Mario will have a role similar to that of Hollow Ichigo from Bleach, Dark Naruto from Naruto: Shippuden and Vanitas from Kingdom Hearts Birth by Sleep.