Ei

Shogun Raiden is a firm believer in what she believes to be eternity, a place where everything remains the same, regardless of what actually happens. She is honorable in her conduct and is revered by the people of Inazuma.

The Shogun exists in two forms: Ei, his true identity, and the Shogun, a puppet created by Ei to act as ruler of Inazuma.

While Ei remains relatively stoic compared to most people, she is noticeably more emotional and friendly than the Shogun. Unlike the Shogun, Ei has both likes and dislikes, such as a fondness for sweets. Due to her dedication to eternity, Ei is wary of the idea of ​​change, though she shows more curiosity than disdain when it comes to new things, such as the appearance of the Traveler and the ways of the modern world. Because she has lost many of her loved ones over the centuries, Ei is driven by a fear of further loss and wishes to preserve Inazuma for all eternity. To this end, she sealed herself within the Plane of Euthymia in an effort to preserve herself from the effects of erosion, while creating the Shogun to be immune to the decay of the physical body. While on the Euthymia Plane, Ei was apathetic towards anything that did not affect her pursuit of eternity, and held a low opinion of human ambition due to ambition leading to loss and suffering, making it incompatible with eternity. Even on the Euthymia Plane, however, she could not truly escape loneliness, as she was happy to see her friend Yae Miko again.

Ei has a major weakness against desserts, as he believes that desserts cannot pose any serious obstacles to his quest for Eternity; this is also mentioned by Yae Miko and Venti, with the latter suggesting that the Traveler bring him desserts to exploit this weakness.