Berserker-class Servant who was introduced in the 2022 GudaGuda event. Komahime was a princess of the Warring States period and the daughter of Mogami Yoshiaki, daimyō of Dewa. Though she was slated to marry Hideyoshi's illegitimate child Hideyori, after a proper heir was born in Hidetsugu, Hideyori was sentenced to death and Komahime was executed along with him. Her tragic end at the age of fourteen inspired her father to side against Hideyoshi.
She is the other half of the Servant Sen no Rikyu, with her forming the basis of Rikyu's current appearance. The two bonded over their mutual hatred of the Toyotomi clan and, along with the spirits of countless others who shared their grudge, merged together into one Servant. While her personality lies dormant in Rikyu's First and Second Ascensions, she takes over in their Third Ascension.