|Affiliation|| Yamamoto House, JAPAN|
|Level limit|| 32|
|Skill levels|| Bow Combat Lv1|
|Mentioned in||Sengoku Rance|
Tarou was the younger brother of Yamamoto Isoroku. He was the heir of the Yamamoto House, but when the house was destroyed by the Ashikaga House, Tarou was imprisoned and used as an extortion to force Isoroku to become a commander for the Ashikaga, since they were interested in her amazing talent as an Archer.
Unknown to her, Tarou was actually killed under Ashikaga Choushin's orders, which she only found out after the Ashikaga House was destroyed by the Oda House. His title as the heir of the Yamamoto family was taken by the child between Isoroku and Rance, Yamamoto Rangi, who's currently a newborn baby.
- Tarou made a cameo appearance along with his sister in the last episode of the Rance 01: OVA during the credits, though his face was still not shown.