Mephiles is a demon from another realm (Sonic 06 displays Mephiles) that was formed from Shadow's shadow. He was sealed in the Diamond. But before that, he wanted to rule the world and to merge with the Iblis Trigger (Sonic. Play 06 to see more) but is now sealed in the Crystal. He has crystals on his body because he was sealed in it for so long. http://media.moddb.com/images/members/1/277/276820/mephiles_rules.jpg
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No. The show ended in 2004. Mephiles was created in 2006 for games only.
Mephiles has no mouth because when Eggman, Rouge and Shadow fought over the Scepter of Darkness. Mephiles was released and the first being he saw was Shadow, so he copied Shadow's shadow. Shadows don't have mouths, do they? Hence why Mephiles has no mouth. But, there is no explanation that I have for why Mephiles has no nose.
Technically since Princess Elise blew out the flame of Solaris in the past. Mephiles never existed.
Mephiles the Dark was a character and was one part of the being that was the primary antagonist from Sonic the Hedgehog. Mephiles has three forms; the first and original was a dark, blackish-purple formless ooze or gas with some gaseous qualities. In his second form, Mephiles appears almost identical to Shadow the Hedgehog, aside from having green eyes, no visible mouth, and the fact that everything that is red on Shadow is gray on him. His third form (and his preferred one when he uses his abilities) was a crystalline, anthropomorphic hedgehog form resembling the appearance of other hedgehogs in the Sonic series, such as Sonic himself; in this form, he has no visible nose, mouth, or feet. His name was based on the one of the names of Mephistopheles related to the legend of Faust.
No. Mephiles only appears in Sonic the Hedgehog 2006, and his existence was wiped out by the change in timeline.