Zeo is a Japanese wobbegong fish-man and the self-proclaimed Noble of the Fish-Man District. He was an officer of the New Fish-Man Pirates before their downfall and disbandment.

Due to his actions and role, he is considered to be a major antagonist in the Fish-Man Island Arc.As a Wobbegong shark, Zeo is a tall and thin fish-man with a strange body, covered in wavy light blue and indigo stripes, and 02 tattooed on his chest. Tentacle-like whiskers hang from his face, and unlike other fish-men, Zeo does not seem to have ears nor a nose, nor does he have a visible mouth. However, as he is able to speak, listen, and consume Energy Steroids, it is obvious that he has them. He sports a dorsal fin, and gills on his long neck.

His legs are covered by what appears to be some sort of long inducement, with a pattern identical to his body's and the New Fish-Man Pirates' Jolly Roger in correspondence of his right knee. Around his waist is a belt with a round buckle, and his feet seem to be covered by dark boots.[1]

As a teenager, he looked almost identical, with the only differences being the smaller size, the lack of the number tattoo on his chest, not having the gill marks on the side of his neck yet, the simpler belt around his waist and the pair of loose pants he wore back then.

Due to the negative effects of the Energy Steroids, his body became old and weak. He now sports a white beard resembling his tentacles, bushy eyebrows, a skinnier crooked neck, and something of a pot belly.