Omachi

About
Omachi is the Northern Guardian of the One Eyed House.

Originally, she was the previous Youkai King, known as Her Knowledgeable Highness the Nine-tails Fox of Insane Star (狂星九尾・未知女殿, Kyouseikyuubi Matsuchi-joten), and led the Great Youkai War against the humans. However, after being defeated by One Eyed Masamune, she fell in love with him, stepped down as the Youkai King, and faithfully followed Masamune from then on.

With time, she became aware of the suffering she caused in the Great Youkai War and doesn't like being in Owari because she was responsible for the death of the father of Kouhime and Nobunaga.