Shinobu

About
A legendary Kunoichi who served under the original Oda Nobunaga in the Great Youkai War. She was found as a baby on the battlefield by Gekkou, who cut his own left arm off to allow her to live with him and act as his "new hand". The two were inseparable to the point where, after Shinobu sustained serious injuries during battle, Gekkou blew both of them up so they could die together.

In Sengoku Rance, it is possible to recruit both her and Gekkou during a second game, where it is revealed that the two were struck by lightning moments before the explosion and sent to the future, where they promptly begin serving Oda House. She does not function as an actual unit in battle and instead continues to serve in Gekkou's unit as his trusted "hand". This appearance is entirely not cannon though.

If she and Gekkou are character cleared and deployed into battle alone, the two blow themselves up to defeat the enemy, mirroring their previous sacrifice and finishing the two off for good.

Trivia

 * Shibata Katsuie became a lolicon after first laying his eyes on her, and has had an obsession with her ever since.