User blog comment:The Shadow Of Darkness/The Final Sonic Storybook Series Game Ideas./@comment-3551372-20120109150002/@comment-207.118.31.88-20120110002523

If I were given the access to the character. I could give him an alternat storyline, revive him by creating another Mephisto from another timeline and/or Dimension where he instead of trying to become one with Iblis, he's trying to fight it and possibly kill Iblis so he can gain freedom and have a normal life.

Anybody could do the same thing with their characters too. And don't say that his existence in timeline is gone because there are also alternate takes with each universe (e.g. Scourge from the comic books).