Dr. Vegapunk is the leading scientist of the SSG and in the employment of the Marines. His work includes discovering the secrets and uses of seastone, the secrets of how Devil Fruit powers work, the co-discovery of the Lineage Factor and its applications, the creation of the Pacifista and Seraphim, and various other scientific achievements that are said to be at least 500 years ahead of current technology.

The greatest scientist in the One Piece world

Also known as Im or Mu, this person is the one who secretly sits on the Empty Throne at the center of the world. Imu, whose gender is unknown, refers to themselves as "Mu" and speaks in third person using formal old school English.

The existence of Imu is kept top secret by the World Government of One Piece. Nobody should know about Imu except for the Five Elder Stars (the Gorosei). That's because the Empty Throne symbolizes that there's no one ruling the entire world, but that's a lie.