Baku (Anbu)

was a member of Konohagakure's Anbu.

Background
During the reign of the Second Hokage, he was one of the Anbu ordered to keep an eye on the Uchiha clan in order to prevent them from rebelling again.

Appearance
Baku wore a white Anbu mask with red markings around the eyeholes as well as above and below it. He also wore a black, hooded cape standard for the team.

Abilities
Peeking from behind his mask, his eyes were said to be able to perceive everything.

Trivia

 * A is also a mythological Japanese creature said to eat dreams and nightmares. As a chimera with an elephant's trunk, a rhinoceros' eyes, an ox's tail, and a tiger's paws, they resembled somewhat the real-life tapir. After the two creatures were connected, the Baku was more and more often depicted as a tapir. Modern images depicting Baku as actual chimera are rare.
 * "Baku" is presumed to be his codename.