Taizō Kiritsubo serves as the leader of the organization B.A.B.E.L. He possesses an intensely strong attachment to the three powerful esper children—Kaoru Akashi, Shiho Sannomiya, and Aoi Nogami—doting on and spoiling them excessively. This overindulgence likely contributes to the children's occasional mischievous or problematic conduct, though he often shifts blame for their actions onto their field supervisor, Kōichi Minamoto.

His name carries a familial connection to the characters from *The Tale of Genji*. The surname Kiritsubo, meaning "paulownia" and "jar, pot, vase," along with the given name Taizō, meaning "emperor" and "three," directly references the Emperor Kiritsubo, father of Hikaru Genji in the classic tale.