The names "Sharaku Hosuke" and "Wato-san" are references to Sherlock Holmes and Watson.

On his forehead is a third eye that, if open, reveals his extraordinary psychic powers and diabolical personality.

To protect mankind from his terrible power, he is made to wear a bandage that seals his third eye.

While his third eye is sealed, Sharaku knows nothing of his true nature or of his power, and does not remember his evil half's sinister attempts to conquer the world.

Two NES games were created based on The Three-Eyed One called Mitsume ga Tōru, with Sharaku as the main character.