Raiden Kunikuzushi was a prototype puppet based on the features of the previous electro archon, Raiden Makoto. After her sister, Raiden Ei, created Kunikuzushi, she thought about keeping him instead of discarding him like planned. 

Designed to hold the electro gnosis and carry out Raiden Ei's will. He is tasked to maintain "Eternity" throughout Inazuma.

He is cold, stern an emotionless puppet that can kill an opponent within a single electric strike. He is a foe no one wants to mess with. 