Captain Zero is the devious and scheming owner of the Z-Stack fleet. He is known to have criminal connections. He only appears in a very small number of episodes, and is quite bad tempered. Nothing else is known about him, not even if he's human or not. it's Suggested that he's Bigg City's Mafia Don, Especially in High Winds, Featuring Johnny Cuba .
If there were a further 13 episodes, more of his personality would probably have been exposed.