Frankie has confirmed on Bungie.net a claim on the Game Informer website, that a Halo character will appear in the upcoming Dead or Alive 4 for XBox 360. Apparently it will be an unlockable character. According to the man himself:
“It’s cool. And by cool, I mean totally sweet.”
I think the character will be Cortana. First, the DOA games are notorious for their female characters, especially how well endowed and scantily clad they make them. Secondly, the image at the bottom of Frankie’s post shows various shillouettes. One of these looks like Cortana, and it moves, stretching up on its toes and back down – resulting in a bouncing breast movement that is so DOA.
As for the rationale for a Halo character appearing in the DOA universe, well:
“You’ll be pleasantly surprised by the explanation for a Halo character in the DOA universe, even if it’s a bit tongue in cheek.”
Frankie promises more details in a future update.