Will A. Zeppeli is a pivotal character in the anime series 'JoJo no Kimyou na Bouken' (JoJo's Bizarre Adventure). He is a master of the ancient martial art known as Hamon, which he uses to combat supernatural threats. Zeppeli plays the role of a mentor to the protagonist, Jonathan Joestar, teaching him how to harness the power of Hamon to fight against the antagonist, Dio Brando. His wisdom, bravery, and selflessness make him a respected figure, and his sacrifice becomes a significant turning point in the story, deeply influencing Jonathan's journey.