Red Woman

Miyoko Fukai (風海　美代子), better known by her alias of the Red Woman (赤髪の女 (Akagami no Onna) is one of the major villains of Kamen Rider Heisei. She is the only known human among the villains.

Pre-Series
In 2005, Miyoko was a college dropout who was too busy studying the paranormal to care about the studies she was supposed to do. It was at this time she discovered a Monolith, and conducted her own research into what she could do with it. One night, during an experiment with an unknown and, in her own words, "unbelievably annoying" lab partner, she accidentally opened a Ganma Hole and sucked him inside. Marveled by what she had discovered, it was at this moment she began her decent into the darkness.

Kamen Rider Heisei
Like her Ghost counterpart, Chikara Saionji, she first appears performing a Ganma-summoning ritual, providing the Ganma that emerges with some sea cucumber so that it can evolve into its Empowered Ganma form. After the Ganma is destroyed by Kamen Rider Heisei, the younger sister of one of the Ganma's victims, Nara mentions that an obstacle to the Ganma regime has appeared, and Miyoko storms off in anger.

She later breaks into the Drive Pit after hearing Nara's plan of using one Rider's gear against another, debriefing the three Ganma summoned on their mission. Through these Ganma, she manipulates an officer named Rei Tenshi (as well as Krim Steinbelt, by extension) into creating a Ganma Hole so that more Ganma can enter the world. This plan is foiled by Heisei, who uses an Oomedama attack to seal the Ganma Hole. While Miyoko mentions that all of their hard work was for naught, Nara assures her that this failure could help them in the long run.

She later appears at Amanogawa High School, threatening to kill everyone in the entire school if someone did not sacrifice themselves to create the Fourze Eyecon. Unfortunately for her, a student holding a Kamen Rider Club patch has sincere feelings for the rider, so she reluctantly unseals the Parka Ghost. Before she leaves, she warns the students that should she need a replacement Eyecon, she would not hesitate to kill.