The pinnacle of Ei's swordsmanship is the Musou no Hitotachi, the symbol of ultimate power. The sword skill is said to be only witnessed during "divine punishment." According to the in-game archive description for Shibas, Ei was once allegedly quite fond of the dog breed. Both Ei and The Shogun have recited multiple poems in the character demo and other media The previous Electro Archon, Ei's older twin sister Makoto, also known as Baal, died 500 years ago in the cataclysm.