Midoriko is a supporting character in Sword Gai: The Animation who first appears as an underground idol and a champion of the fighting game Blade Soul Game. She is small in stature, with blue hair tied into two pigtails, each tipped with a yellow ball, and dark blue eyes. Her typical outfit is a schoolgirl uniform. Midoriko becomes a wielder of a cursed weapon known as the Flamberge, a blade that can ignite and unleash fire-based attacks. Her background is rooted in unchecked privilege; she is depicted as a spoiled adolescent whose chronic boredom and lack of empathy gradually evolve into outright cruelty and immorality. Her personality is bold and confident, and she is never afraid to speak her mind, even at the cost of making enemies. Her fame as a champion instills in her a sense of pride that often borders on arrogance. After a violent incident during a tournament, her life takes a dark turn, and following her transformation into an Armed Demon, her actions become more ruthless and unpredictable. Her motivations are largely driven by a desire for stimulation and power, and she is easily manipulated by others who appeal to these impulses. In the story, Midoriko acts under orders from Grimus of Wrath. She targets Rie Matoba, kidnapping her in order to trigger the awakening of Shin Matoba. This act draws both Shin Matoba and Gai Ogata into a confrontation with her. Midoriko faces off against Gai in a fierce battle, but her overconfidence leaves her vulnerable. Her key relationships include her service to Grimus and her antagonistic interactions with Gai and Shin. Her development follows a downward trajectory from a proud idol and gamer into a ruthless, corrupted being. Her notable ability is the command of the Flamberge, which allows her to produce and control fire in combat.