Live action TV
Description
Ayumi Mizuchi is a secondary antagonist from the first story arc of the Sukeban Deka manga and its 1991 original video animation adaptation. She is the middle sister among the three Mizuchi siblings, positioned between the eldest sister Remi and the youngest sister Emi within the Mizuchi crime family. Prior to the main events of the story, Ayumi was instrumental in carrying out a horrific plan devised by Remi to murder seventy-six of her schoolmates from Takanoha Gakuen High School. This was accomplished by attaching gas tanks beneath two school buses, which rendered the students and drivers unconscious before the vehicles plunged off a steep cliff to their deaths. Following this massacre, a new batch of students was enrolled, and Ayumi's father, Gozo Mizuchi, sought to exploit their parents to further the family's political and financial success.

In terms of personality, Ayumi is characterized by a deep obsession with wealth and power. At Takanoha High, she is treated like royalty and maintains an outward pretense of being very lady-like, but this facade conceals a ruthless and tyrannical nature. She systematically bullies and extorts money from the student body, demanding they hand over their cash. Her fortune is further accumulated through drug dealing and donations received from her father. Ayumi is deeply arrogant and prone to underestimating her opponents, a flaw that becomes critical when she encounters the protagonist. After Saki Asamiya intentionally throws an early fight against Ayumi's bodyguards, Ayumi mistakenly concludes that the newcomer does not pose a serious threat to her control of the school.

Ayumi's primary role in the story is as one of the first major obstacles Saki must overcome while investigating the corruption at Takanoha High. She commands a group of four bodyguards known as the Four Devas, who enforce her will and bully students into submission. Her position as the school's top ruler is challenged as Saki begins to gain influence, roughing up students and shifting their loyalty away from Ayumi. After Saki effortlessly defeats the Four Devas and publicly humiliates Ayumi on the school grounds, Ayumi becomes consumed by a desire for revenge.

The key relationships in Ayumi's life are with her two sisters. She turns to Emi for help in her vendetta against Saki but is refused. Remi, however, offers her a shotgun to hunt down and kill Saki. In a tragic twist, this weapon is rigged; when Ayumi locates Saki and pulls the trigger, the gun explodes, inflicting fatal injuries. In her final moments, Ayumi realizes that Remi deliberately sabotaged the weapon in order to eliminate her and seize control of the vast hidden fortune Ayumi had accumulated in a secret base in the woods. This betrayal highlights the treacherous and ruthless dynamics within the Mizuchi family itself. In the manga continuity, Ayumi also has significant interactions with the character Junko Yuina, whose artistic abilities she destroys by having her hand run over by a motorcycle gang, and she plays a role in the events leading to Junko's death.

Regarding development, Ayumi's character arc is one of a seemingly invincible tyrant whose empire crumbles rapidly. Her arrogance blinds her to Saki's true strength, and her thirst for revenge makes her vulnerable to her own sister's manipulation. Her death serves as a direct consequence of both her underestimation of Saki and her family's inherent treachery. Notably, despite her greed and involvement in the drug trade, some source material suggests she showed a degree of loyalty to her family and was considered the least morally corrupt of the three Mizuchi sisters. In terms of notable abilities, Ayumi does not possess any unique fighting skills of her own, relying instead on her wealth, status, and the Four Devas to maintain control. However, a distinctive trait attributed to her in the OVA is the ability to speak English better than an American hood, demonstrating a level of sophistication that contrasts with her violent criminal activities.
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