Tony Tony Chopper is the doctor of the Straw Hat Pirates. Chopper is a reindeer that ate a Devil Fruit called the Hito Hito no Mi. He came from Drum Island, which makes him the only member of the Straw Hat Pirates 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 Beli100 due to being mistaken for the crew's pet. 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 reattached after being broken during his search for the Amiudake when he was younger (where he thought the Amiudake can cure Hiluluk's disease) and ran into the leader of his old herd, who severely injured him. 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 much more "chibi" like appearance, meaning that when in his preferred transformation (which he calls Brain Point), he has a larger head and eyes and a less defined muzzle than earlier in the series. Many female characters, such as Nami, Robin, Makino, Porche, Shakky, and Vivi find Chopper very cute. There are even males that find Chopper cute such as Foxy. A running gag is that various characters in One Piece think Chopper is a tanuki (raccoon-dog, often simply translated as "a raccoon") while in his Brain Point or hybrid form. The word "tonakai", which is the Japanese word for "reindeer", is where the "Tony" in Chopper's name is derived from. His Heavy Point or human form is likewise mistaken for a gorilla (or an abominable snowman on his home island). Typically, it is rare for doctors to fulfill roles other than medical practices for the benefit of those around them, but as the Straw Hats' 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 formal training (as well as his Rumble Ball's time limited effect) Chopper was originally considered part of the "Weakling Trio" along with Nami and Usopp. This lay largely in his lack of battle intuition and naïveté at the time, though it is shown that he has gotten much more capable after his two years of training on Torino Kingdom.


Being the doctor of the crew, Chopper possesses a vast knowledge of both medicine and medical drugs as well as the preparations of most remedies and ointments ranging from regular fruits, roots, and vegetables that can be found and used on most islands. He is also capable of administering surgery and resuscitation. Most of the healing methods that he uses are from the things he learned during his apprenticeship under both Dr. Hiluluk and Kureha, with the latter teaching him most of the medicinal procedures that he has so far mastered. After the timeskip it is assumed that his medical skills have only improved. A notably demonstration of this was in the Zou arc, when he led the Straw Hats that were with him along with the island's doctors in saving the Minks that were badly injured by Jack and his forces and poisoned by Caesar Clown's Koro weapon. In addition while he was under the apprenticeship of Dr. Kureha, Chopper became aware of the highly addictive drug NHC10 (which only selected scientists in selected countries are allowed to use), and its harmful side effects. He is capable of stabilizing the condition of someone suffering from an overdose of the drug. Perhaps as another testament to his intelligence, he was also able to invent his very own drug known as the "Rumble Ball", through a little research; which helps to increase his Devil Fruit's fighting capabilities (detailed further below). He has also been shown being able to give successful blood transfusions (even between to different species: a human and a fishman, though human and fishmen do carry the same blood), as he did to save the lives of both Sanji and Luffy, after too much blood loss (even knowing their correct blood type: Luffy's blood type being F (the same as Jinbe's), and Sanji's blood type being S RH- (an unusually rare blood type)). Chopper has eaten a Zoan-class Devil Fruit (the second Zoan-class Devil Fruit shown in the series, after Dalton) known as the Hito Hito no Mi, which allows him the ability to transform into a human and human-reindeer hybrid at will. However, the fruit has granted Chopper more than just the ability to transform; it has also given him human intelligence, which allows him to both speak and think like an actual human. This is what allowed Chopper to become a doctor and learn about medicine in the first place, which is impossible for a normal reindeer. While Chopper is usually seen in his human-reindeer hybrid form, which is a tanuki-like chibi-creature, he would sometimes transform into his human form to try and fit in with humans, often with minimal success. But when in combat, he also uses his Devil Fruit powers in order to fight his enemies with the strength given to him by the fruit and usually transforms into whatever form best suits the situation.

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