Beel may be a baby, but he’s been fortunate to have had some power ups over the years. Granted, he’s supposed to be tough even in baby form, but we never saw a whole lot of proof for that. Chao has his big robot, which is always impressive as it can even fire a giant laser. Chaos can evolve into Light and Dark forms, which are immortal, but he needs more offensive capabilities if he is going to make this a close fight. Beel wins.