Uesugi Kenshin

Profile
Leader of the Uesugi House and known as the "God of Warfare", her swordsmanship is unparalleled in JAPAN. She often leads the charge into enemy forces like an unstoppable whirlwind. Many female generals gather to her from all over JAPAN.

Whenever she learns that another country is in danger and needs help, she will immediately send forth her troops without consideration of the situation of her own house.

During the events of Sengoku Rance, Kenshin was requested to have a duel with Reira. Kenshin won the duel by dealing Reira a flash move.

Trivia
Inspired by the historical figure Uesugi Kenshin. There is a theory in Japan that claims Uesugi Kenshin was actually female, based on a couple of historical evidences.

The part about being the #1 swordsperson in JAPAN is likely to be a reference to a different Kenshin.