Tony Tony Chopper/Abilities and Powers, One Piece Wiki

Typically, it is rare for doctors to fulfill roles other than medical practices for the benefit of those around them, but as the Straw Hat Pirates' doctor, Chopper's responsibilities are not limited to just medicine alone. He occasionally performed tasks like steering the ship as their unofficial helmsman while on the Going Merry, and during the heat of battle, he can also fulfill the role of a physical fighter to support his friends. However, due in part to his lack of battle experience or form

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