Kasuga

Kasuga is a heroic ninja introduced in Sengoku Basara. Her name may be a reference to Kenshin's main fortress, Kasugayama Castle.

 Kasuga was sent on a mission to kill Kenshin Uesugi. However, when she had her target in sight, Kasuga fell in love with Kenshin. After failing to assassinate Uesugi she was banished from her village. From then on Kasuga served Kenshin and became his most loyal ninja. She takes her duties seriously, and due to the Kenshin's battles with Shingen Takeda (as well an implication that they are from the same ninja village) a rivalry grew between Kasuga and Sasuke Sarutobi. Additionally, the two ninja have opposite elements.

She is often seen as having a rivalry with Nouhime as well, due to the other woman's role as Nobunaga's love interest and protector, and their similar personalities.