Itsumi Ryōgoku embodies Ryōgoku Station (E12, Toei Ōedo Line) with orange hair framing his face to his ears and distinctive purple eyes. His personality is hot-blooded, loud, and friendly, marked by a deep enthusiasm for Japanese history and historical dramas. This passion reflects the cultural significance of the station's real-world location in Sumida Ward's Yokoami district – an area often misread as "Yokozuna" – and specifically its proximity to the preserved park site of Kira Yoshinaka's former mansion.

As the station's manifestation aboard the Miracle Train, Ryōgoku actively leverages his historical knowledge to assist passengers facing personal challenges. For instance, he aided the fortune teller Mirai in reconciling with her business partner by using historical themes to reconnect her with her original motivations, fulfilling the train's purpose.

He operates alongside fellow station embodiments Roppongi, Shinjuku, Tsukishima, Shiodome, and Tochō. Within this group, Tochō explicitly recognizes Ryōgoku's identity as a historical drama enthusiast. Together, they focus on addressing the concerns of distressed passengers boarding the train.