Caesar Anthonio Zeppeli (シーザー・アントニオ・ツェペリ Shīzā Antonio Tseperi) is a major ally to Joseph Joestar featured in Battle Tendency.

Caesar is an Italian Ripple user and disciple of Lisa Lisa. He is the grandson of William Anthonio Zeppeli, and battles the Pillar Men alongside his comrades and teachers to honor his heritage as a Zeppeli.

Caesar A. Zeppeli is a young man of muscular build and sporting unkempt hair, whose distinctive features are two colored spots on both cheeks. He is extremely handsome, managing to easily swoon several women using his good looks, among other things.

Caesar's trademark accessory is his long thin headband patterned with a row of tessellated triangles and adorned with two feathers on each side of the head.

Caesar Zeppeli is a hot-blooded but focused man, dedicated to the fight against the Pillar Men.

When he was young, Caesar and his siblings were seemingly abandoned by his father, making him a bitter and extremely violent delinquent. When he was saved by his father from the Pillar Men's trap at the cost of his life, Caesar changes his hate into great pride in his family name.

Caesar is introduced as an arrogant Ripple User looking down on Joseph Joestar's sub par Ripple ability and missing no occasion to ridicule him and antagonize him in general. However, he reveals himself to be an honorable man, taking pride in his family's tradition of battling evil as well as wishing to avenge the death of his friend, Mark, at the hands of the Pillar Men. When Joseph reveals himself to be an honorable individual as well, their relationship considerably improves. In general, Caesar is respectful to his elders and superiors, most notably his master Lisa Lisa. When it comes to his peers, while he maintains at best shallow relations with this around him, when he truly cares for someone it is true love best evidenced by his relationship with Joseph (and pointed it by Messina).

Caesar's other defining trait in his short-tempered personality. He is quick to jump to a fight, even though he knows it is detrimental. Taking great pride in his family name, when Joseph told him that he didn't care about that, Caesar hit him without thinking. That character flaw proved fatal when he made the mistake of rushing to Wamuu's lair alone and then try to finish him off up close. Having great determination, Caesar kept on fighting despite being fatally wounded and made a loud eulogy of the human spirit just before dying. Caesar is nonetheless a very serious person most of the time, zealously fighting the Pillar Men and is exasperated by Joseph's antics.

Caesar is a ladies' man and has a habit of flirting with beautiful women whenever he can, invoking deeply romantic gestures. With his charm and charisma, as well as his own words, he is able to steal the kisses of multiple women with some to minimal interaction beforehand. The only exception to this treatment is Lisa Lisa, despite her noteworthy beauty; She is Caesar's Ripple instructor, whom he claims to respect as much as his own mother.

According to JoJo6251, Caesar dislikes unsophisticated, irresponsible people, and bugs.

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As a child, Caesar idolized his father, Mario Zeppeli. When he was 10, however, his father left him and his siblings with no explanation or warning. As a result, Caesar grew to hate his father, thinking he was out living a new and carefree life without them. His mother was missing years prior for unknown reasons, and relatives soon stole everything left from his now orphaned family, driving Caesar to become a delinquent and thug when he was still a child. He made a name for himself committing every crime imaginable short of murder, and was widely feared. He used a wrench to start all his fights and quickly finished them. Back then, Caesar wasn't aware that his Ripple energy had fully awakened, and that he was using it in his battles.

When he was 16, Caesar spotted his father walking in Rome; he tailed him with the intention of killing him, going through a secret passage under the Colosseum that lead to the Pillar Men. Caesar saw a jewel in the wall they'd been encased in. Not knowing that it was part of a trap set up by Wamuu, he accidentally activated it, but his father pushed him out of the way before he could be killed himself. Having sacrificed himself despite not recognizing his own son, Caesar regained his respect toward his father and swore revenge on the Pillar Men.

Some time after the event, Caesar finds Lisa Lisa in Venice at the dying request of his father. He trains with her to use the art of the Ripple, but apparently has learned little more than the fundamentals, since he still has to go through the final part of the Ripple training in order to master it fully, alongside Joseph.