For completion's sake, sure. If there's one thing I hate in Fighting Games, it's non-playable boss characters. So yeah, more than any other character except maybe Julia (if Lee/Violet and Bob/Slim Bob get their own slots, then why not?), I'd love to see Azazel playable. I mean, I get that as he was in Tekken 6, he'd be completely broken, so maybe they could scale him to a more manageable True Ogre size, and adjust his moveset a little. And ban him from Ranked, just like Combot.
I think Azazel is a good Ogre replica!hahah
Not a replica, he got his own moves and doesn't breathe fire!
And if Namco is lazy they can always use his Tekken 6 model.