Kunoichi

Kunoichi is the fictional female ninja bodyguard of Yukimura Sanada, being based loosely on Yukimuras real ninja bodyguards, the Sanada braves. As she is fictional, the characters she encounters refer to her indirectly, rather than giving her a proper name (oddly enough, Yukimura never refers to her at all, instead using their conversations as an opprotunity for monologues). Masamune Date comes the closest, refering to her as Vixen. She has a fierce rivalry with Hanzo Hattori, as their lords are rivals, and she constantly tries to prove that she is a better ninja than him, while he views her as a novice. Goemon Ishikawa views her as his apprentice, and often invites her to come with him on his adventures, to which she often declines in a respectful or joking manner. She often is an obstacle for Masamune to overcome, and he refers to her disdainingly as Vixen, in his arrogant manor, while she views him as an overactive delusioned child

She was removed in Samurai Warriors 2 but Nene shares her weapons and several aspects of her moveset, so she appears to be a replacement of sorts