Mayumi (One)

This article is about a key character from Kamen Rider Zero-One: Prologue. This article will feature spoilers present within the series.

Biography
Mayumi, also known by her alias of One, is a hacker within the year of 2021. She is the operator of Zero, someone who she describes as a mechanized cyberframe, which is essentially a cyborg.

Throughout the series, she is seen within cyberspace, alongside her partner, to track down any nearby Shells and eliminate them. Her main goal is to catch the eyes of the world and draw awareness to the illegal operations of the cyber-terrorist group, Crash.exe. To do so, she streams the encounters with each Shell across the web.

It is established that she is a fan of the original 1971 tokusatsu series, Kamen Rider. Back then, she watched the show with her father.

History
In her current time period, she feels the world has changed for the worse. In her words, the world she lives in is governed by greed, consumption, and hate. It is a time where the evolution of machine has surpassed that of man. Day after day, people go missing, likely kidnapped by those who are apart of Crash’s operations, and are transformed into living cybernetic husks called Shells which serve to destroy and manipulate data at the whim of the highest bidder. In a time of chaos, she makes an effort to make a Rider of her own in order to save her corrupt world.

At an unspecified point in time, she came across Zero’s original human body and patched him up, giving him a copy of her own mind. He was given the ability to transform into two stages when engaging combat, Zero Stage and Zero-One Stage. Though, at the time, Zero’s body was not capable of handling Zero-One.

It is also apparent that she has an illness, made clear through the many coughing fits she enters. To handle the unknown illness, she has to take her medication.

Abilities

 * Cybernetic Engineering: She was able to repair Zero and create imperfect replicas of Ichigo's Typhoon Belt and Aruto's Zero-One Driver and corresponding Progrise Key

Trivia

 * It is established in Episode 03 that Mayumi has a fear of spiders.