He’s a Reindeer that ate the Hito Hito no Mi, or the Human-Human fruit.
This turned Chopper from an ordinary reindeer into a humanoid reindeer with human intelligence and speech.
The life of a pirate tends to change a person.
Like all other Zoan-bang out fruits, there are three default forms that the user can turn into.
Their default state, the full-form of the fruit, and a hybrid form.
It is reminiscent of when Luffy would become Chibi Luffy after he first developed Gear Third.
Again, it is simply his default state after having consumed the Human-Human fruit.
8Deer Form
This form is where Chopper takes on his reindeer appearance.
The real power of the Gum Gum fruit.
This allows him to gain increased jumping capabilities while still being able to fight or attack.
This form is only marginally useful.
This form is a pretty good all-rounder.
5Guard Point
With Guard Point, this form is completely focused on defense and nothing else.
He becomes spherical, with his fur growing and extending out, covering his whole body except his face.
These Marines are among the strongest characters in One Piece.
In terms of pure defense, there is no form like Guard Point.
4Arm Point
With Arm Point, this is Chopper’s offense-oriented form, at least Pre-Timeskip.
However, after the Time-Skip, he develops Kung-Fu Point.
1Monster Point
Chopper’s ultimate form, Monster Point, is the strongest form he has.
In return, he becomes absolutely massive, gaining extreme strength and durability.
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