Ayu Arata serves as Shin Arata's older sister. Her surname potentially draws inspiration from Niida Station, a former freight stop on the JNR Chikuhō Main Line, while also reflecting the Japanese word "arata" (新た), signifying "new". She possesses vibrant green hair, frequently tied in a ponytail featuring a distinctive streak, complemented by yellow eyes. Ties and shorts define her characteristic outfit. Ayu features in several episodes of *Shinkansen Henkei Robo Shinkalion Z*, such as Episode 01 and Episode 33.