Official vehicle name: E233-4000 series. A 6-car set. The eldest sister. Originally for the Nagatsuka Line, she was converted for the Hokuto Line in 2026. A tomboy who is often mistaken for a boy. Her favorite food is udon.

Official vehicle name: E233-4500 series. A 4-car set. The eldest son. Used on the Nagatsuka Line. He wears glasses and has a butler-like personality. His favorite food is chocolate.

Official vehicle name: E233-9500 series. A 5-car set. The second son. His equipment differs in various ways from the 4500 series. His favorite drink is tapioca milk tea.

Official vehicle name: E233-800 series A21 set. The third son and the youngest. A set equipped with top-tier interior facilities. It is a 3-car set with 2 doors. He has the personality of a young master. His favorite food is steak.