He is the son of Will Zeppeli and lives in Naples and works as a carpenter. Considered the best carpenter in the city, Mario had a happy life, having a work he loved and a large family. Mario's wife died sometime during Caesar's youth. Mario had known since he was young of the fate of his father, Will Anthonio Zeppeli. Because of this, he researched the Stone Masks and found the Pillar Men long before Germany's discovery, Mario had spent his life training his Hamon and left his children behind.