User blog comment:The Shadow Of Darkness/The Final Sonic Storybook Series Game Ideas./@comment-3551372-20120109150002/@comment-207.118.31.88-20120110003107

1. I simply gave him a nickname.

For the rest...

Wrongo!! Mephiles or Mephisto (it's the same name man, with an abbreviation) were erased in one timeline, in another he is gone from creation, and in another, he is alive and well. It wouldn't for a spin-off but maybe for another appearence.