|This article is about a/an villain in Kamen Rider Fourze.|
Skydain, Groundain, and Black Knight were created by Professor Blink; but the Kyodain went rogue and attacked the professor. The professor proceeded to seal their power in the satellite they were in, forcing the Kyodain to assume weak human forms. Under the guise of the clumsy assitant to Harumi Saeba (her brother's guise), Ayumi Kinoshita (木下 あゆ美 Kinoshita Ayumi?) of OSTO Legacy, Skydain plotted with her brother to use the Kamen Rider Club to regain their powers and take over XVII. When their plan succeeded, the Kyodain began their genocide attack with XVII but Kamen Rider Fourze Cosmic States managed to foil the plot with his warp drive ability. Enraged, the Kyodain fought him and Kamen Rider Meteor. While at first having the advantage, Fourze gained the Fusion Switch and after a long battle destroyed them with the States' Limit Break.
Skydain is armed with built-in blades in her arms. She is quicker and more agile than her brother. Skydain is able to transform into a jet-like form called the Skyjet (スカイジェット Sukaijetto?).
- Skydain is an homage to Skyzel from Space Ironmen Kyodain.