- Other name: Kansuke (勘介)
- Japanese: 馬詰 柳太郎 (Mazume Ryuutarou}
Mazume Ryûtarô Joined the Shinsengumi around the 5th month of 1863. He deserted the Shinsengumi with his father Mazume Shinjûrô during the 6th month of 1864, on the day of the Ikedaya Incident. It is unknown what became of either of them.
- Shinsengumi Zentaishi Tettei Guide (新選組全隊士徹底ガイド) Maeda Masaki