Are you kidding? Blaze of course!
Makes a pact with Mephisto who in turn traps the demon Zarathos within Blaze's body. Blaze must struggle to control the raging demon within. Oh man, the cover artwork from some of those comics were awesome. The flaming wheelies and such...just classic. The JB GR was a total badass, more antihero, if hero at all. That's what made it great, he wasn't just another good guy.