Ran Kuroki

Ran Kuroki is a new first year student who appeared at the start of Gentaro Kisaragi's third year. While at first hostile towards Gentaro and older students, she eventually becomes an ally of the Kamen Rider Club. Ran has also been revealed to have the potential to become the Pisces Zodiarts, the final Horoscopes.

Personality
Ran was at first hostile towards Gentaro and any older students due to a bad experience in middle school. Ran also feels a need to protect her friend Haru Kusao since he was always bullied in middle school. This need is so great, she felt like she was the only one who could convince him to give up the switch, refusing any help from the Kamen Rider Club, and getting in Fourze's way for a Limit Break. Unfortunately, this only fueled Haru's desire for the switch's power and broke their friendship. Seeing the Kamen Rider Club help find Haru's friendship bracelet despite her protests, Ran starts to believe in her seniors and becomes Gentaro's friend.

Abilities
Ran is versed in swimming and aikido, using her skills to effortlessly throw Gentaro around, even as Fourze.

The Libra Zodiarts saw with his Eye of Laplace that Ran has the potential to become the Pisces Zodiarts.

History
In middle school, Ran had a bad experience with senior students which started her distrust for older students.

On Gentaro's first day in his third year, he attempted to befriend Ran and Haru, only for Ran to violently refuse. When Haru was given a Zodiarts Switch and became the Musca Zodiarts, Ran tried to have Haru, while getting in the way of the Kamen Rider Club's fight with it. However, Haru revealed that he took the Switch because he always felt weak, especially when Ran always protected him. As his form further evolved, Haru threw away the friendship bracelet Ran gave him into a river.

Ran tried to find to it, refusing Gentaro's help, not even telling him what was lost. Even then, Gentaro had the Kamen Rider Club go look for the bracelet. She was shocked when they found it and decided to trust her new seniors. Ran was able to snap Haru out of his madness by apologizing for making him feel weak and useless through her protection, allowing Kamen Rider Fourze to destroy the Musca Zodiarts without any further psychological problems to deal with later. Afterwards, she and Haru both ask to join the Kamen Rider Club, and they are made provisional members until Haru is fully recovered.