Tony Tony Chopper

Tony Tony Chopper (トニートニー・チョッパー) is a doctor of the Straw Hats pirates and the sixth member of Luffy's crew. He meets them when the Straw Hats sailed on Drum Island to heal Nami. Chopper is a reindeer who was treated as outcast for his blue nose. Later on, he ate the Devil Fruit "Hito Hito no Mi" which allowed him to take on a human form. However, this caused him to be cast away by both reindeer and humans who came to fear him. He was rescued by Doctor Hiruluk who gave Chopper his name and made him his assistant. After the terminally ill Hiruluk passed away, Chopper then became a pupil of another doctor named Kureha on Drum Island. He later assisted the Straw Hats in defeating Wapol before joining them.

Personality
Chopper is very naive and childish at times. He is also easy to impress and very fond of compliments. Despite this, he takes pride in being called a doctor and thinks that doctors should help other people no matter what. Because of that, he cannot forgive those who call themselves "doctors" for personal gain.

Fighting Style
Chopper uses his Devil Fruit to morph into different forms which have several functions depending on the situation (like using a human form to gain strength, or changing into a reindeer-human hybrid form for additional speed). He also created a jaw-breaker, called "Rumble Ball" which enhances his overall strength. Eating three of them causes him to transform into an uncontrollable monster momentarily.