Marionnettiste, also called The Puppeteer, serves as an employee within Haijima Industries' Skills Development Laboratory, specifically in the research and development division focusing on pyrokinetic applications and weapon systems. She possesses lengthy eyelashes, light pupils, and dark hair tied in a ponytail. Her attire consists of a loose white shirt with a large frilly collar, dark trousers, and shoes, featuring a distinctive angel-themed belt buckle she frequently highlights. Personality-wise, she displays a cheerful, friendly, and bubbly schoolmarm demeanor, especially towards children, leveraging research and common knowledge to make herself and her puppets appealing. This amiable facade conceals a manipulative and condescending core; she perceives both people and robots as predictable objects to control, believing children exist for adult exploitation. This conviction allows her to rationalize their misuse by her employers. When provoked, her demeanor shifts dramatically to sinister and vengeful, singularly focused on punishing the source of her anger while ignoring other dangers. As a Third Generation pyrokinetic, her power centers on controlling specialized puppets named "Dominion" via unique wires. These small puppets possess exceptional strength, capable of flipping vehicles and firing potent flame blasts. Immune to standard electromagnetic interference due to their fire-based energy, they remain vulnerable to destruction by strong electrical surges overloading their wiring. She also commands an advanced "Dominion of Punishment" model equipped with concrete-slicing claws and electrical insulation. Additional abilities include projecting flames from her feet to slow her descent and a keen expertise in mechanics, enabling her to design, build, and diagnose both her equipment and enemy technology mid-combat. Her story unfolds during the Haijima Industries arc. Tasked with overseeing children traumatized by Yūichirō Kurono, she employs her puppets for entertainment. When Special Fire Force Company 8 attacks, she engages them, using her Dominion to assault their vehicle before battling Maki Oze and Vulcan Joseph. After Maki destroys her initial puppet, she summons a swarm of replacements, abruptly annihilated by Haumea of the White-Clad. This redirects her fury towards Haumea, whom she continues pursuing even after Vulcan temporarily nullifies Haumea's abilities. A notable trivia detail is her cross-shaped eyes, resembling the crossbars of marionette control wires, symbolizing her puppeteer motif.