Kiryuu Kaoru

 Kiryuu Kaoru is a denizen of the Dark Fall and always together with her sister Michiru. She and Michiru come to Yuunagi Junior High as exchange students in an attempt to infiltrate Pretty Cure, but eventually end up becoming friends with them instead. In FwPCSS49 she takes on the power of the wind to help defeat Goyan. Because of this, many fans consider her to be heir of the Cure Windy (キュアウィンディ, Kyua Uindi?) name, although that was never explicitly stated in the series.

Later on, Michiru and Kaoru were faced to fight their friends, Hyuuga Saki and Mishou Mai. Instead of fighting, because of their newly gained friendship with the two, Michiru and Kaoru sacrificed themselves to rescue Saki and Mai from their leader, Akudaikan. As a result of this, all memories of them in the Land of Greenery disappeared.

After the Dark Fall manages to steal the Fairy Carafe, and resurrect all the defeated denizens, Michiru and Kaoru join together with Saki and Mai against the Dark Fall.

The two sisters decide to go confront Akudaikan, without Pretty Cure, but they follow them anyways. During the last battle, the Sky Tree grants Mupu, Fupu, Flappy, and Choppy new power, enabling Saki and Mai to again become Cure Bloom and Cure Egret, and Michiru and Kaoru get the forms of Cure Bright and Cure Windy respectively. They defeated Goyan together with Spiral Heart Splash Star.

Cure Bright
In the last episode of Futari wa Pretty Cure Splash Star, Michiru took the place of Cure Windy(キュアウィンディ, Kyua Uindi), as Mishou Mai reverted to Cure Egret. In this form, Kaoru performed Spiral Heart Splash Star with Cure Bloom, Cure Egret, and her sister, Kiryuu Michiru, who took the role of Cure Bright.