Wheel Demon (Touhou)

This presumed-demon is the first stage midboss of Mystic Square character that appears on the road to Makai. Based on the story of the game, it's presumed that she's a resident of Makai. Once she appears on the screen, a electrified ring of some sort with four blue circles on it appears around her than starts spinning clockwise at a speed, where she starts attacked the heroines when danmaku will start spitting out as she orbit anti-clockwise around the screen. Once defeated, she drops an S power up item. She appears to be simply a stronger demon and that seems to be one of the many demons leaving Makai. Since she's got no dialogue with the player, nothing is known about it.