Chopper is a blue-nosed reindeer who ate the Human-Human Fruit and gained human abilities. Treated like a monster after becoming a reindeer-human, it was Dr. Hiriluk who saved him. He aspired to fulfill Hiriluk's dying wish by becoming a doctor himself. His dream is to become a doctor who can cure anything, thus turning himself into a "miracle cure".
With his advanced knowledge and skills, Chopper is an excellent doctor for the ship's crew, but in order to be a strong man who can help them all out, he also works hard to use his Devil Fruit abilities in combat!
As a former reindeer, Chopper has a keen nose, and can talk to other animals.