The Shogun is cold and stern in personality, even callous at times; she is limited in emotional expression, has no likes and dislikes, and has no need for recreation. The Shogun thinks of herself as Ei's assistant and carries out her creator's exact will, unable to act on her own volition. If her usual functions are disabled, the Shogun becomes ineffectual. Due to limited protocols as a result of Ei's initial indifference towards anything other than "eternity", the puppet is able to be manipulated by external influences.

While Ei has a more stern demeanor than the average person, she is notably more emotive and sociable than the Shogun. Unlike the Shogun, Ei has preferences, such as a love for sweets and passion of martial arts. Due to her dedication to eternity, Ei maintains a wary attitude on the idea of change. She demonstrates curiosity rather towards new affairs, such as the appearance of the Traveler and the customs of the modern world. Due to having lost many of her loved ones over the centuries, Ei is driven by a fear of further loss, wanting to preserve Inazuma. To this end, she previously sealed herself in the Plane of Euthymia to keep herself from the effects of erosion. She created the puppet Shogun to ensure immunity from the decay of her physical body. While in the Plane of Euthymia, Ei was indifferent to anything that did not affect her pursuit of eternity and had a low opinion of human ambition due to it resulting in loss and suffering. Thus, making it incompatible with eternity. While in the Plane of Euthymia, she was not unmoved by loneliness, as Ei is shown enjoying Yae Miko and the Traveler's company.

Ei: "Dear me, that didn't frighten you, did it? After all, you are in the presence of the most supreme and terrifying incarnation of lightning in the whole of Teyvat."

Shogun: "No salutations needed. My exalted status shall not be disclosed as we travel among the common folk. I acknowledge that you are a person of superior ability."