- This is a historical Japanese name; the family name is Yamauchi.
Yamauchi has a distinctive mole on his forehead, and a chonmage haircut. He wears a lavish dark-coloured kimono with a red-and-gold haori.
Ryu ga Gotoku Ishin!Edit
During Chapter 9, Ryoma discovers that his kyoudai, Takechi Hanpeita has been forced to commit seppuku by Yamauchi.
After Takechi and Ryoma's battle, Yamauchi finally appears in-person at the top of the Tosa tower. He shoots at Ryoma, but Takechi jumps in front of the bullet and is hit instead. Yamauchi reveals that he plans to make Japan a part of England, and that Ryoma's help in restoring imperial rule has been beneficial in his plan. After this, he attempts to kill Takechi, but Ryoma stands in front of him. and refuses to move. Ryoma is shot in the abdomen and shoulder, but still manages to stumble towards him despite his injuries. Ryoma tells him that this is the determination of people who fight for love.
Yamauchi tries to run off, only to stumble into Nagakura Shinpachi, who grabs Yamauchi by the face and throws him down in front of Ryoma. Yamauchi tries to crawl away to the left, but finds Okita Souji standing over him. Hijikata Toshizo awaits him as he crawls right. Yamauchi begs Ryoma to save him, promising him not only Tosa, but all of Shikoku. Ryoma refuses his pleas, and tells him that he is being ridiculous; it is not up to one individual to decide which direction the country takes, but everyone who lives there.
Yamauchi changes tactics, instead threatening them by saying that the British fleet is approaching, and that there is no way they will be able to beat them. Ryoma says that it makes no difference whether they win or lose, stating that even if they are defeated this time, Japan will rise up as many times as it takes to win in the end.
Ryoma raises his sword, and ignoring Yamauchi's desperate pleas, strikes the killing blow.