Caesar Anthonio Zeppeli is a friend of Joseph Joestar and one of the allies who appeared in the Battle Tendency saga. He is a hot-blooded but focused young man, hopefully dedicated to defeat the Pillar Men.
He is voiced by Takuya Satou in the Japanese version, and Bryce Papenbrook, who also voices Rin Okumura, Masaomi Kida, Makoto Naegi, Nagito Komaeda, Meliodas, Kirito, Eren Yeager, Zidane Tribal, Butters Stotch, Shirou Emiya, Guan Ping, Rokuro Enmado, Lance, and Cat Noir in the English version.
In Caesar's childhood, his father had seemingly abandoned his beloved siblings, making him a bitter and aggressively violent delinquent. Once Caesar was rescued by his father from the danger with the Pillar Men at cost of his life, he changes his hatred into the great pride in his surname.
Caesar is initially described as an arrogant Ripple User seeing down on the Ripple ability of Joseph Joestar and without occasion to ridicule and betray him in general. However, he reveals himself to become an honorable individual, making pride in traditional pride of his family to fight evil as well as his hope to avenge death of his friend Mark at the hands of the Pillar Men. Even Joseph reveals himself to become an honorable man due to their relationship that considerable improves. Caesar has a lot of respect to his elders and superiors in general, notably Lisa Lisa as his master.
In Caesar's hot-blooded personality, he is too fast to jump to a fight quickly, even he remembers it is detrimental. While Caesar is taking his great pride in his family, when Joseph told him not to care about that, Caesar hits him without even thinking. So his flaw is fatal when he made the mistake of going to the lair of Wamuu alone and tried to finish him off. Having a great determination, Caesar has kept beating despite being wounded by himself and made a loud sound of the human spirit before his death. Most of the time, Caesar is a serious person who challenges the evil Pillar Men and is exasperated by Joseph's different antics.
As Caesar can invoke deeply romantic gestures, he is a Casanova and has an ability to flirt with beautiful women.
Caesar has an appearance with a muscular build and unkempt hair, whose distinctive inclusions are two-colored spots on his cheeks. His accessories are his long thin headband with a row of tessellated triangular patterns and two feathers on each side of the head.