Rumble Ball

The Rumble Ball is something Tony Tony Chopper made through research (and a bit of an accident, according to the Anime). The "Rumble Ball", when eaten, gives Zoan-type Devil Fruit users several more transformations for a three minutes by 'distorting the wavelengths of transformation'. For Chopper, if comes with 4 more transformations:

For detail,see on the various combinated forms,see Hito Hito no Mi.

First Appearance: Chapter 148; Episode 88