|Name in Japanese||山南 敬助|
|Rōmaji Translation||Yamanami Keisuke|
|Appears in||Anime, Manga, TV Drama, Stage Show|
|Voice Actor (Japanese)||Norihiro Inoue|
|Voice Actor (English)||Christopher Ayres|
Keisuke Yamanami (山南 敬助 Yamanami Keisuke ) is the first vice commander of the Shinsengumi. Yamanami (often called "Sannan" by Kondō and Hijikata, which is an alternate reading of the kanji in his name) is a good-natured and thoughtful figure, providing a counterpoint to Hijikata's blunt and Machiavellian tendencies. He also loves children and takes a shine to Tetsunosuke. He is beloved by his fellow Shinsengumi members, and, like Hijikata, is firmly opposed to putting a sword in Tetsu's hands. He is carrying on a clandestine affair with a Shimabara courtesan named Akesato.
- Yamanami is loosely based on the historical figure, Yamanami Keisuke.