Hyō

is a member of Konohagakure's Anbu faction: Root.

Personality
Like most Root members, he's still loyal to Root's founder Danzō Shimura and is apparently trustworthy enough to be given the task of delivering top-secret information for him.

Abilities
Although Hyō hasn't displayed any techniques, he is able to sneak up on Sai without being noticed until he strikes, implying that his stealth is on a high level. Like all members of Root, Hyō carries a tipless tantō, which he seems to be skilled with. He is very aware of his surroundings and knows when someone is spying on him.

Sasuke and Sai Arc
He infiltrated Sai's home and pulls his tantō on him. He handed Sai a letter containing info on his real mission, reminding Sai about the will and purpose of Root. While they were talking Hyō felt a presence hiding outside so he threw a kunai only to find that it was the cat who scrambled off scared.