Nejiyanagi Yuuko is a character in Heybot! who parodies Yamamura Sadako from The Ring. She has long black hair that covers one eye, green eyes, and usually wears a white dress with a green screw as a necklace. She is often depicted with sharp teeth. She is sometimes depicted with half-closed eyes, and other times with wide crazy empty eyes with no pupils. She's often coupled with Kowakowatto Natsuo.
Later in the series he forms the basis and/or alternate persona for several additional characters in the series including Pluto (Heybot!), Furuido Yuuko, and Vocamente Yuuko.