Fūgetsu Ōtsutsuki

The Zenhōi kage (全方位影, Omni Shadow) was the legendary figure who spread the teaching of Zen in the north. Like her presumbed bother she defeated the Kuzuryū and sealed it within her own body, thus becoming the first jinchūriki of the north.

Background
According to stories, the Zenhōi kage was a priestess who appeared long ago in an age of endless war. She was the first to explain about zen, as she tried to use her power and wisdom to lead the world to peace instead of war.

During her travels to the north she engaged in battle with a powerful beast. It was said the battle lasted eight days and eight nights at the end of the eight night the layed defeated. Using her abilities she sealed the beast within herself, the same way her brother did. Like the beast her brother sealed, its power was so great that the seal would break after the her death.

Knowning this she split the beast into eight different forms giving way to the Eight Demons. While keeping the final part of the beast sealed within her. Even after spliting the beast it stilled proved powerful. Using her a powerful seal she sealed the beast within a star and hearled it into space. Upon her death bed she passed on the eight weapons to her children each gaining one.

Using the weapons the children set out to find the Demons upon defeating the demons they sealed within the weapons giving the children great powers.