Demak is one of the Dark Signers. He wears the black robes of the Dark Signers accented with gold stripes. He has great hatred towards the Signers. It has not yet been determined when he appears in the anime, only guess would be after Akiza fights Misty.
It is believed that he owns the dark mark of the Nazca God of the monkey, as seen in the battle in episode 30.
