Zoan Devil fruits are having a moment in One Piece right now, thanks to the Kaido and his crew being users of them. Most Zoan devil fruits allow their users access to three forms: their original form, an animal form, and a hybrid of the two.
Tony Tony Chopper, the Straw Hat Pirates' doctor, is different. He has so far revealed a staggering 10 forms that come from his use of the Hito Hito no Mi (Human-Human Fruit). Here's a breakdown of each form and how it works.
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Chopper is a blue-nosed reindeer from the wintry Drum Island, and thus his true form is that of a fairly large-sized deer. He calls this form the Walk Point. Chopper uses this form primarily for transportation, as he can run faster than most of his other forms using Walk Point. He also uses it to disguise himself because he can pretend to be a simple animal in that form.
Chopper's Heavy Point is technically his «Human Form» but he looks more like a yeti or Sasquatch due to being covered in fur. Except for his Monster Point, this is Chopper's largest form, and he is significantly taller than regular-sized men like Luffy, Zoro, and Sanji. The heavy point is capable of immense strength, but is not as strong as some of Chopper's other offensive forms.
Rounding out Chopper's basic forms is his hybrid form, which he calls the Brain Point. This is the form Chopper uses most often when not in battle. He is incredibly small in this form, just under 3 feet in height. On the rare occasions he uses it in battle, it's to scope an opponent's weakness or to dodge an attack that would have hit a larger form.
After conducting extensive research, Chopper developed a drug called the Rumble
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