Tony Tony Chopper

Tony Tony Chopper (トニートニー・チョッパー) is the doctor of the Straw Hat Pirates. Chopper is a reindeer that ate a Devil Fruit called the Hito Hito no Mi. He comes from Drum Island, which makes him the only member of the Straw Hat Pirate Crew who was born on the Grand Line. He is the sixth member of the crew and the fifth to join Luffy, as well as being the youngest member on board. He has a bounty of 50 due to being mistaken for the crew's pet.

Appearance
Most of the time, Chopper is a toddler-sized human/reindeer hybrid, but his Devil Fruit abilities allow him to change his appearance depending on the situation. Chopper's left antler is braced at the base by a metal plate because it was broken in a fight when he was younger. He usually wears a large pale red/pink fuzzy top hat with a sideways medical cross (given to him by Hiluluk) and a maroon pair of shorts. He also sometimes wears a blue backpack that has the same sideways medical cross as his hat. He also has a remarkable blue nose. As Oda's style evolved and many readers commented on how cute Chopper was, Chopper has been given a more "chibi" appearance, meaning that when in his preferred transformation (which he calls Brain Point), he has a larger head and eyes than earlier in the series. Many female characters, such as Nami, Robin, Makino and Porche, find Chopper very cute.

Similar to most of his male crewmates, Chopper has the same outfit throughout most of the series.

In Alabasta, he wore a shirt with a green-lined collar, then a bigger one with giant sleeves that is light blue with dark blue liners.

At Enies Lobby, he wore a red leather jacket.

A running gag is that various characters in One Piece think Chopper is a tanuki (raccoon-dog, often simply translated as "raccoon") while in his Brain Point form. This is a play on the similar word "tonakai", the Japanese word for reindeer, from which the "Tony" in Chopper's name is derived. His Heavy Point or human form is likewise mistaken for a gorilla (or an abominable snowman on his home island).

After the two-year timeskip, Chopper wears a new blue cap that has ring of dots around the circle, while the cap has buckles hanging from it. He wears this over his old pink hat. He also wears a white and yellow vertical-striped tank top and a orange pair of shorts. Aside from being slightly slimmer, Chopper's Brain Point form hasn't changed. His Walk Point (reindeer) form has grown considerably, now being roughly as tall as Usopp. His horns are larger, he has more muscle, and his fur is longer. His Heavy Point has become exceedingly larger and more muscular, being almost the size of Dosun. He also developed new transformations through his research during the timeskip, which he debuts on Fishman Island, including Kung Fu Point (which he uses to defeat Neptune's soldiers) and a revised Horn Point (which he uses against Daruma).