Cortez

Cortez is the 5th boss from Paper Mario: The Thousand-year door. He has 20 hp in each of his 3 forms. After you defeat him, you have to go back to him for help. He goes to your aid after Flavio gives up the skull gem to him. After the chapter, he can be talked to to sail his boat to Keelhaul Key. It should be noted that he is one of the few bosses to turn good in the Mario series. His name may be a reference to Hernan Cortes, the explorer.