Chopper, whose full name is Tony Tony Chopper, is a beloved character from the anime and manga series One Piece. He is a reindeer who gained human-like intelligence and the ability to transform after eating the Human-Human Fruit, a type of Devil Fruit. Chopper is the doctor of the Straw Hat Pirates and is known for his compassionate nature, strong sense of curiosity, and dedication to helping others. Despite his adorable appearance, especially in his small "Brain Point" form with a pink hat and blue nose, he can transform into various powerful forms using a drug he developed called the Rumble Ball.
 
These transformations make him a formidable fighter when needed. Chopper is often shy and modest, blushing when complimented, though he deeply cherishes the praise. He has a touching backstory involving his mentor, Dr. Hiriluk, which helped shape his desire to cure any illness and become a doctor who can help people around the world.