Tony Tony Chopper’s Rumble Ball, Explained
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The One Piece world offers no shortage of methods for characters to increase their power, but the effects of some strength-boosting supplements are only temporary. Prime examples of this trade-off are Emporio Ivankov’s hormones and Fisher Tiger’s Energy Steroids, which make anyone who uses them much stronger for a short period at great peril to their health. However, Straw Hat Pirate Tony Tony Chopper develops a different type of supplement that works exclusively with his Devil Fruit to give him access to new abilities. The Rumble Ball is one of Chopper’s greatest inventions to become well-known as one of his trademark fighting strategies.
Tony Tony Chopper’s past as a resident of Drum Island under King Wapol’s corrupt rule plays a huge role in the development of the Rumble Ball. The Human-Human Devil Fruit that empowers Chopper’s transformations is just as important to the supplement’s creation because of its link to how Rumble Balls work. Chopper’s use of the Rumble Balls slowly evolves throughout his adventure as a medic on the Grand Line, eventually becoming a reliable tool in his battle arsenal.
Drum Island is a hub of medical intelligence before King Wapol, a corrupt ruler, executes the world’s best doctors gathered in the kingdom in a tragedy known as the Doctor Hunt. The devastating loss hampers advancements in medicine and the ability to treat sick people, leading to a weakened population ravaged by illnesses. King Wapol enslaves twenty of the most talented doctors for his personal care, but two other top doctors escape the hunt. The two doctors, Hiriluk and Kureha, come to mentor Tony Tony Chopper in medicine, eventually leading to the invention of the Rumble Ball.
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