Blue Gorillas

Blue Gorillas, nicknamed by the Impel Down guards and prisoners as Blugori, are large masked gorilla-like beasts with skulls painted on where their faces should be and with mechanical-like fingers. They act as guards and food gatherers for the prison by hunting the nearby Sea Kings. They all look relatively the same and each carries a large doubleheaded axe. They are all extremely powerful; they all have Super-Human Strength, high tolerance for damage and are expert swimmers. These things have been called mindless bloodless monstrosities by the prisoners of impel down.

They were first seen chopping up a Sea King to bring in meat. When Buggy escaped they were assigned to chase him and Luffy (unintentionally). Buggy was not able to even faze one of them, but Luffy managed to defeat five due to his immense strength.