If I can allow Mr. Fixit as a character I'll allow Doomrider.
Besides, he's a Daemon (fancy way of spelling demon). Like Ghost Rider (Who I would allow if someone wanted him) on cocaine. So basically I'm seeing this guy as the bastard child of Ghost Rider and Rocxso, the Rock and Roll Clown, and I am deeply amused.
If things get too absurd, I'll GM spank.