The eldest son. The flagship train of Oba Express Railway, sporting a blue stripe. His favorite food is sushi.

The second son. Unlike the 0 series, he wears a red stripe. His hobby is visiting Takanori Myojin Shrine. His favorite station is Kida Station.

The third son. Due to a revision in the Series 001 design concept, his structure has been partially modified. (Details omitted from wiki). His favorite drink is Cola.

The fourth son. Added in 2009 to handle long-distance transport. He can couple with other Series 001-1200s and certain Series 2000 cars, and is always on good terms with the 2000s. His favorite drink is green tea.

Series 001-6000. The fifth son. Like the 1200 series, he was introduced for long-distance transport. He uses overseas equipment and offers a comfortable ride. He wears glasses and has a refined, young-master vibe. His favorite drink is black tea.

Converted from some 0 series sets in 2011 and introduced to the Imon Line. Since he was modified from the 0 series, they are relatives (also an eldest son type). He is best friends with the Series 2000 Imon cars. His favorite food is broiled saury.

The eldest daughter. Introduced based on the 0 series after a 17-year gap. Her relationship with the 0 series is... friendly, I think? Her favorite drink is orange juice.

The youngest daughter and younger sister to the 1500 series. She is doted on by the Series 001 brothers and other Oba Express Railway trains. Sometimes she and her sister have a bit of a 'yuri' vibe (they just get along really well). Her favorite drink is apple juice.

The sixth son. Also the youngest. Debuted in 2026 as a company car to succeed the DD01 electric locomotive. After handling new equipment transfers and scrap transfers, he went into general service in September. He mainly handles freight operations. A young man who gets along well with the Series 001 siblings. His favorite food is coffee milk.