Barthandelus had class and style. And his voice acting was pure brilliance. (Can't believe it was the same guy who did Logos in FFX-2...) I really, really want to see him come back in the sequel - if only to mock Lightning. "You thought I was dead? Oh, child, PERISH THE THOUGHT...!"
Barthendelous should appear but not as a powerful being. Like some monstrous cieth-like creature who's gone through an intense personal hell since the end of XIII and comes to your character begging to be put out of his misery.
Legend of Zelda: Majora's Awakening of the Skyward Oracle Ocarina Princess Wakers Phantom Spirit Adventure Cap to the Past coming to Super Wiicuboy Advance 64DS