Raundo

Introduction
Raundo is a young boy who is resides inside a plastic ball filled with water from the fountain of youth. In reality, he is a very old man has to stay inside the ball to keep his Devil Fruit ability in check and maintain his enternal youth. With all the knowledge he gained over the years, he has become an extraodinary doctor and is currenly on the run from the World Government as they are after the water inside his bubble.

Devil Fruit
For further information: Rotto Rotto no Mi

Haki
Kenbunshoku Haki: Color of Observation

Busōshoku Haki: Color of Armaments

Haōshoku Haki: Color of the Conquering King

Character Design
This character was initially made a joke as a ball as a crewmember until it was much more further developed.