Kasagoba, called Kasagon in the anime, is a marbled rockfish fish-man who once rode with the New Fish-Man Pirates. He served as one of the foot soldiers who tried to bar the Straw Hats from reaching Fish-Man Island.
Stocky and beige-toned, Kasagoba has a thick neck dappled with brown spots and topped by pink, yellow-tipped trailing growths along his head and neck. He sports a white tank top over vertically striped trousers and tends to wear a broad grin.
Given his place among the New Fish-Man Pirates, he very likely shares the crew's deep loathing of humans, though little else of his character is shown.
His fish-man heritage gives him natural strength roughly ten times that of a human, a figure that climbs higher beneath the waves, yet a single punch from Luffy was enough to lay him out. He carries a pike, though he was never shown putting it to use in a fight. He first appeared riding Sea Beasts alongside Hammond and Hyouzou to head off the Straw Hats outside Fish-Man Island, where the trio demanded the crew either enlist with the New Fish-Man Pirates or be destroyed. The Straw Hats answered with a Coup de Burst that rocketed them past, leaving Kasagoba stunned before the group fell back to report to Hody Jones. A later ambush at Mermaid Cove ended the same way, with Kasagoba and Hammond knocked unconscious while Hyouzou hauled them off.

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Kasagoba, known as Kasagon in the anime, is a marbled rockfish fish-man who belonged to the New Fish-Man Pirates and was one of the crew that tried to stop the Straw Hats from reaching Fish-Man Island.
Kasagoba is stocky and beige-toned with a thick, brown-spotted neck topped by pink, yellow-tipped growths, and he wears a white tank top with striped trousers.
As a fish-man, Kasagoba has roughly ten times human strength, a figure that climbs higher underwater, but a single punch from Luffy was enough to knock him out.
Kasagoba, alongside Hammond and Hyouzou, tried to force the Straw Hats to join the New Fish-Man Pirates outside Fish-Man Island, but the crew escaped using a Coup de Burst, leaving Kasagoba stunned.
Kasagoba served under Hody Jones as part of the New Fish-Man Pirates crew.
Looking for more on Kasagoba? The One Piece Wiki on Fandom has a dedicated page with community notes.
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