Nikkou

One of the only two swords in The Continent that can harm demons and Demon Kings. She is one of The Legendary Five that challenged Demon King Gele 1500 years ago. She was a samurai before turning into sword form.

Nikkou can take human form as seen in Kichikuou Rance. Also in Kichikuou Rance, Chaos complained that God is not fair because she can transform back to human form while he can't, even though they both wished the same wish to the god.