Nikkou

Nikkou is one of the only two swords on The Continent that can harm Dark Lords and the Demon King by going through their invincibility fields.

About
She was originally a human samurai and one of The Legendary Five that descended a 1000 floor dungeon in order to gain a method to challenge Demon King Gele 1500 years ago. After they beat a prototype god, Planner descended and decided to grand them one wish a piece. Both Nikkou and Chaos wished to have a blade capable of penetrating the invincibility fields of dark lords and the demon king, but as a twist, both of them were transformed into a sword. She was turned into a Katana (called Holy Sword Nikkou) while Chaos was turned into a western style blade (called Demonic Sword Chaos).



In Kichikuou Rance, Nikkou could take human form, unlike Chaos who complained that the 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.

In the current canon, Nikkou doesn't have the ability to turn back into a human, but, like Chaos, retains the ability to speak.

She appeared for the first time in canon in Sengoku Rance, along with Kentarou and Miki Kurusu. Kentarou is Nikkou's wielder and is a very talented swordsman that can make the best of her. Chaos felt eager to kill Miki, since he claimed that he turned into a sword with the sole purpose of killing the Demon King and reproached Nikkou for helping them. Nikkou said that she felt pity for Miki because she didn't chose to become the Demon King, so she's willing to help them. She claimed that Chaos should be able to feel the same way.



List of wielders
Considering that Nikkou, like Chaos is now nothing more than a talking sword, in order to fight the dark lords and the demon king, she needs a wielder.

Several hundred years ago, Nikkou was wielded by a Hero of the world but during his combat with the recently freed dark lord Xavier, he turned twenty, lost his Hero powers and was killed by Xavier (though Xavier was sealed once again thanks to dark lord sealing techniques taught to members of the Tenshinism sect).

Later a hero used her in the "Operation: Bomb the Mazeel Line" to repel Dark Lord RedEye from the Mazeel Line and save Zeth from destruction.

Afterwards, it is unknown to whose hands she passed to, until eventually she was found by Kentarou in a bandit camp. After Kentarou somehow defeated the bandits, he took Nikkou as his own and has been Nikkou's wielder ever since.