Employed at Haijima Industries' Skills Development Laboratory (Ability Development Laboratory), the character known as "Dominions' Lady" or "Puppeteer" manages and mentors children newly awakened to pyrokinetic abilities. She utilizes specialized mechanical puppets called "Dominion" to create a comforting, engaging environment, countering the children's fears, particularly around intimidating figures like Yūichirō Kurono. Her cheerful, approachable demeanor features a self-proclaimed "good big sister" persona. This friendly exterior masks contrasting traits emerging under stress; while initially bubbly and focused on making tools and interactions "cute" to strengthen bonds, she reveals a condescending, sinister side when sufficiently irritated. Internally, she views people, including children, as predictable objects for adult control and use, demonstrating no guilt over Haijima's exploitation despite her caretaker role. As a Third Generation pyrokinetic, her ignition ability manipulates Dominion puppets via thin control wires, functioning like marionettes. These puppets derive power directly from her thermal energy, granting immunity to electromagnetic interference. Smaller than a child, they possess exceptional physical strength—capable of flipping vehicles like Company 8's Matchbox and denting its armor. They execute potent flame attacks labeled "Gas Blaster," projecting concentrated fire from exhaust-like components, and demonstrate flight capabilities alongside high durability, withstanding assaults from advanced weaponry like Maki Oze's Iron Owls. One specialized variant, the "Dominion of Punishment," features insulated construction immune to electrical damage and claws sharp enough to slice through concrete. Beyond puppetry, she exhibits technical proficiency in mechanics, likely designing and constructing the Dominion units herself, and projects flames from her feet to slow aerial descents. Her analytical skills extend to diagnosing enemy equipment weaknesses mid-combat. Her narrative involvement occurs predominantly during the Haijima Industries arc. Tasked with pacifying children disturbed by Kurono, she confronts Special Fire Force Company 8 during their facility assault. Using her Dominion puppets, she overwhelms Company 8 by overturning their transport vehicle and engaging Maki Oze and Vulcan Joseph. After Maki destroys her primary Dominion, she prepares to deploy a swarm of secondary puppets. This effort is abruptly thwarted by Haumea of the White-Clad, who obliterates the remaining units. Enraged by Haumea's interference and dismissive attitude, she redirects her focus to attack the White-Clad member. She pursues Haumea when Vulcan temporarily disables Haumea's abilities, though the ultimate outcome of this confrontation remains unresolved. Beyond this arc, no further development, background expansion, or involvement in other media is documented.