Born Julius Caesar Zeppeli, but more commonly referred to as "Gyro Zeppeli".

Gyro has a cocky and flamboyant personality, appearing to have a high opinion of himself. However, he can be driven by emotions for other people and become realistic and serious when a problem presents itself. Like most Manga archetypes, Gyro is incredibly intelligent when he needs to be. His most distinguishable body features are his long hair, western hat and his gold teeth which have "GO! GO! ZEPPELI" displayed on them, revealed whenever he smiles at someone. His signature laugh/chuckle is "Nyo ho ho ho~".

Note that the "Caesar" in his name is pronounced in the traditional Greek way, more akin to the German "Kaiser". This is distinct from Caesar Anthonio Zeppeli from JoJo's Bizarre Adventure Part 2, whose name is pronounced in the modern English way.

In the final battle against Funny Valentine, Gyro uses the most advanced technique of the Golden Rectangle: the "Super (or Cavalry) Spin", which is created by invoking the golden rectangle while riding a horse to gain momentum. By combining this technique with his newly developed stand Ball Breaker, his attack becomes very powerful. Although his technique is very effective, it is not enough to beat Valentine, who resists his injuries long enough for Gyro to die from his own wounds. However, before dying, Gyro gives his last lesson to Johnny, allowing Tusk to reach ACT 4 and giving Johnny the power to defeat Funny Valentine.

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