Tomo stands as one of Nakago's most trusted allies as Nakago freely discusses his plans with Tomo. Though Tomo loves Nakago, Nakago regards him only as another member of the Seiryū Celestial Warriors. Like Soi, he has little desire to harm Miaka, but wants to do anything for Nakago's sake, and has difficulty getting along with Soi and stays away from her, though they can work efficiently together when necessary.
Tomo's abilities as a Celestial Warrior allow him to hypnotize opponents and create illusions involve various senses, additionally being able to put himself into the illusion as a sort of actor to help things along. Employing a clam shell called Shin (蜃), Tomo is able to see his illusions as the unfold and also trap a person's body and mind within it in order to extract their memories. The extracted memories can be used to create a scenario for the victim or be replayed at a later time. A short story in the Genbu Kaiden tankōbon release describes how Tomo received Shin from a young woman.
When he attempts to trap Miaka in an illusory world, he is thwarted by Amiboshi. After trying to kill Amiboshi, Tomo was killed by Suboshi, who appeared to rescue his brother.