Momiji Kanō serves as an executive within the esper organization P.A.N.D.R.A. Recruited by Kyōsuke Hyōbu alongside Shirō Magi at approximately nine years old, she has been affiliated with the group since childhood. Within P.A.N.D.R.A., she acts as an elder sister figure, providing guidance and support to younger members. Her personality blends intelligence and seriousness with cultural knowledge and open-mindedness. She demonstrates reliability in her duties, particularly concerning espionage, hacking, and infiltration operations.

Her synthesized esper abilities center on teleportation, allowing her to transport herself and others through space. She also manipulates spatial dimensions to immobilize objects or areas, creating localized force fields. This spatial fixation grants her significant physical strength, enabling feats like intercepting high-caliber bullets and penetrating advanced telekinetic barriers using only her fingertips. She extends this power to form hand-shaped barriers capable of striking or grasping targets at a distance.

Personally, Momiji harbors a romantic interest in Taizō Kiritsubo, the chief of the esper organization B.A.B.E.L., admiring his appearance which she associates with social status and respect; this attraction is explicitly confirmed in volume 17 of the series. Her interactions with Hyōbu reflect unwavering loyalty, as she deeply admires him and prioritizes his well-being, willing to sacrifice her life if necessary. However, she occasionally challenges his choices, such as urging him to adopt more modern attire over his signature school uniform.

Physically, Momiji possesses a tall stature and slim build. She has long light-blue hair, typically swept to one side, and brown eyes. She consistently wears sunglasses and favors fashionable, often loose-fitting clothing. Her name derives from the chapter "Momiji no Ga" from The Tale of Genji, reflecting the series' broader naming conventions.