Kuroki Ran

黒木蘭

Portrayed by Honoka Rin ほのかりん

After the new school year began, she was introduced as one of the freshman on Kamen Rider Fourze.

Personality

No wilting flower to be protected, Ran has a sharp temper and the aikido skills to back them up. Her best friend is Kusao Haru. They share matching straps that has their names on them.

History

In her previous school, Haru and her were part of the swim club. However, one day Ran discovered that her teammates only liked the pair because they wanted Ran's swimming skills. They were bullying Haru, even taking his strap and tossing it in the pool. Ran becomes furious at this, jumps in the pool in her school uniform, and retrieves it. When she comes out, she swore to never trust a sempai figure again.

Muscus Zodiarts incident

In episodes 29-30, Haru becomes the Muscus Zodiarts. He became fed up with always being protected. As a man, it trampled his pride, he wanted to protect Ran. Hilariously, Ran did not understand this, and continued to say things that pushed him emotionally and caused him to mutate and evolve. At the same time, Ran pushes away Gentarou's help, because she didn't trust sempai figures.

Eventually, Ran is forced to trust Gentarou. After Ran manages to return Haru's humanity, the two swore to someday become a party of the Kamen Rider Club. Thus leading to them becoming provisional members.

The Return of Haru and Ran

In episode 45, the pair reappear. Haru is still hospitalized, but at least Ran is hoping to join the Rider Club. She said she had been working on her aikido skills.

Hayami appeared and tried to protect Ran from Leo. It turned out that Ran is the final Horoscopes member, Pisces.

Pisces Zodiarts

Feeling guilty for doubting Hayami's intent to protect her, Ran presses the Zodiarts Switch, instantly evolving into Pisces Zodiarts.

As Pisces, she can swim in the ground like its water.

Ran being a member of the swimming club and being a strong swimmer in general was probably foreshadowing that she was going to become Pisces.

Pisces Constellation

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Pisces is the twelfth astrological sign, and in the show, she is the last Horoscopes to appear.

"Chances are she spends most of her excess energy (and she doesn’t have too much to spare) helping relatives in trouble or taking on the burdens of friends." http://www.agoyangyang.com/pisces/pisces.html

"Pisceans are very concerned about the problems of the world; they feel that it is a personal duty to make the universe a better place." http://piscestraits.com/

Trivia

A 2chan explanation for how Kuroki Ran's name is a hint that she's Pisces. It's pretty forced though:

The kanji for "fish" broken up to spell Kuroki

True to the spring theme, both Ran and Haru have names related to spring. Kuroki means "black tree" or "unbarked lumber". Ran means "orchid".
- Kusao Haru 草尾ハル means "Grass tail spring".