Keita Mukae works as a fortune teller, popular with female clients for his good looks and predictions clients describe as "freakishly correct." His ability to see spirits contributes to his fortune-telling effectiveness. He possesses supernatural perception like others in the series, enabling him to interact with and exorcise spirits.

He has short to medium-length dark blonde hair styled in a middle part, reaching just past his ears. He wears blue stud earrings and has dark brown eyes that fade to a lighter brown at the bottom. He is an adult with piercings.

He interacts with main characters Kosuke Mikado and Rihito Hiyakawa. His exorcism method involves communicating with spirits to ease their minds before performing the exorcism, contrasting with other methods in the series and reflecting his focus on establishing bonds with people and spirits.

Keita Mukae appears as a secondary character in both the manga and anime adaptations but was omitted from the live-action film. His involvement includes encounters with supernatural incidents tied to the central plot.