Sengoku is a major character in One Piece, serving as a former Fleet Admiral of the Marines and one of the highest-ranking figures in the World Government’s military. Known for his strategic mind, stern discipline, and calm authority, he played a key role in major events such as the Summit War at Marineford. He is also a powerful Devil Fruit user and was once one of the strongest Marines in the world. Sengoku represents the rigid justice and leadership of the Marine organization.