Isn't the umvc3 firebrand the good one from the demon's credt games?
Firebrand is a weirdo case who was made even weirder thanks to localization.
The "species" of demon he belongs to is called the Red Arremers (though some versions of the English GnG games called them Red Blazes or Red Devils I believe). The protagonist of the Gargoyle's Quest games (and Demon's Crest is essentially GQ3 for all intents and purposes) is also named Red Arremer. In fact, in Japan the GQ games are called "Red Arremer".
t's never exactly specified whether the enemy in the GnG games is the same Arremer appearing multiple times or if it's several, however, the implication is that the protagonist of the GQ games is a member of that particular species, much like there's unique Toads called Toad.
In the English localization of Gargoyle's Quest, Red Arremer was renamed "Firebrand", but in Japan his name is Red Arremer still (even in UMvC3 - if you watch Japanese footage or his Japanese announcement trailer, you'll see his name being displayed as such), and he doesn't utilize any powers from the Gargoyle's Quest games either, only from his appearances in the GnG series, which means that it's not exactly clear if he's supposed to be a generic Arremer or Firebrand.
In his own spin-off games, Firebrand is indeed the hero of the demon world, but it IS the demon world, and especially in Demon's Crest it's a quest for personal gain and power, bringing him closer to being an anti-hero.