Just like Hody Jones, Zeo greatly despise humans and desires nothing more than to see them exterminated. When it comes to fishmen, Zeo only respects those who hate humans and hates those who supports humans. Zeo like most members of the New Fishman Pirates also enjoy seeing humans suffer by enslaving them. Despite Zeo's unjustified hatred towards humans, he can come off as foolish when he tries to hide from his enemies by becoming invisible and laying on the floor to only be trampled by the people in panic.
As a fishman, Zeo posses strength that is ten times greater than the average human. Like Absalom, Zeo can essentially become invisible. But unlike Absalom, Zeo can camouflage his appearance to bend into the environment. Zeo is also skilled at using chains in battle; he can use it to even choke his targets. With the energy steroid pills, Zeo's physical strength is further increased and the latter can become harder to deal with in battle. But after overusing the energy steroid pills, Zeo's physical abilities depleted immensely.
As a child, Zeo along with Hody and the other members of the New Fishman Pirates were interested in the adventures of Fisher Tiger and Arlong. As time passes, Zeo along with the New Fishman Pirates began to hate humans even more. Later on, Zeo with the New Fishman Pirates were creating a powerful force of fishman and enslaved humans to overthrow the rule of the Ryuga kingdom.
Fishman Island Arc
Zeo was first seen along with the other members of the New Fishmen Pirates; they were planning an alliance with Vander Decken IX. As Hody Jones plans to overthrow the Ryuga Kingdom on Fishman Island commences, Zeo was seen with the other officers in the city forcing the fishmen citizens to step on the face of Queen Otohime. Zeo along with the other New Fishman Pirates immoblized to go Gyoncorde Plaza to complete their plans.
Once they arrived at the Gyoncorde Plaza, the 100,000 army (which included fishmen and enslaved humans) battled the Straw Hat Pirates and Jinbe. In battle, Zeo attempt to catch Nami off gaurd but instead ended up fighting Brook. In his fight against Brook, he tried to defeat the latter with his camouflage abilities but was overwhelmed by the latter's sword abilities.
After the defeat of Hody Jones, the New Fishman Pirates, and their allies plus releasing the enslaved humans, Zeo along with his comrades were placed in jail at the Ryuga palace. Once behind bars, they were all crippled as a side effect of using the energy steroid pills.
- Like all members of the New Fishman Pirates, Zeo is a type of shark. He is a wobblegong shark.