Kung Fu Dugong

Residing along the Sandora River in Arabasta, these powerful marine mammals are renowned throughout the world for their incredible martial arts prowess. They follow a strict warrior's code where any defeated foe becomes their new master, a rule that also binds all of that master's existing disciples. After an unexpected clash, the entire group now serves as followers to Luffy, who unintentionally became their leader by overcoming them in combat.