Does The Dark Lord's body run on HP rules (since Riddle is the one inside of it) or D&D rules (since it's still Milo's body)?

MAJOR HARRY POTTER AND THE CONFIRMED CRITICAL SPOILERS AFTER THE BREAK

HP rules, because it’s not actually Milo’s body anymore. As described in Chamber of Secrets, Riddle, if successful, would have gained his own, completely new body, and Ginny would have withered away and died. In Harry Potter and the Confirmed Critical, Milo died instead of how Ginny would have if Harry hadn’t intervened. As a result, Riddle got a shiny new body using power he stole from Milo’s soul, and Milo died. But death is cheap for D&D characters, which Riddle didn’t count on. Boccob gave Milo a new body, so now, there’s a Riddle’s new body, Milo’s old, dead body, and Milo’s new body, courtesy of Boccob. Milo’s new body looks exactly like his old one, but Riddle’s new body looks like, well, young Voldemort.

I hope that clears matters up.