Kiryū Kaoru

Kaoru is a major character in Pretty Cure Splash Star. She, along with her sister Michiru, works for Akudaikān as his loyal servant.

History
She and her sister Michiru were created by Akudaikan to help with his goal. She didn't like the bleakness of the desolated Fountain of Sky, but didn't know anything else. Although she and her sister found the spirits Moop and Fuup, they didn't do anything to harm them, even protecting them getting hurt once.

While Dorodoron was trying to defeat the Precure, she and Michiru decided to start posing as students at Saki and Mai's school to learn more about them. Over time, however, they began to grow attached to them as they spent more time with them and their families and friends, though they tried to deny it. Kaoru became especially close to Saki's little sister, Minori, who looked up to her and saw her almost like another big sister.

Because of all of this, she and Michiru had a hard time actually trying to defeat the Precure, and ended up deciding that they didn't want to, though they also didn't wish to turn on Akudaikan. Instead, they decided to try reasoning with him, with Cure Bloom and Cure Egret accompanying them to Dark Fall. However, Akudaikan refused to listen to them, taking this as a betrayal. While Bloom and Egret tried to fight against him and protect Michiru and Kaoru, they were unable to, and the sisters instead chose to sacrifice themselves so their friends could escape.

After this, she and Michiru were imprisoned underwater in Dark Fall, unconscious. During this time, no one from the Land of Greenery besides Saki and Mai remembered them.

Eventually, they awoke again and were able to escape from Dark Fall to help their friends again. They began to do more to actually fight against their old coworkers and were a huge help to the Cures.

In the finale, she used Fuup's power to transform into Cure Windy.

Kiryū Michiru
Kaoru and her sister are pretty close, usually being pretty open with each other about any concerns they have. They trust each other and are usually on about the same page on things.

Hyūga Saki
Originally enemies, Kaoru and Saki eventually became friends.

Mishō Mai
Originally enemies, Kaoru and Mai eventually became friends.

Hyūga Minori
Minori took quite the liking to Kaoru, and Kaoru developed a soft spot for the child herself.

Etymology
Her suname, Kiryū (霧生), consists of the kanji 霧 meaning fog or mist and 生 meaning life or birth. It is also pronounced the same as the Japanese word 気流 (kiryū), meaning air current.

Her given name, Kaoru (薫), comes from 薫る (kaoru), which means to smell sweet. The kanji 薫 can mean to send forth fragrance, which fits better with her wind theme than the more common spelling of the word, 香る (kaoru), with 香 simply meaning incense, smell, or perfume.