Lifespan: Tenbun 4 (1535) to 4/24 of Tenshō 14 (1586)
Father: Shōni Sukemoto
Siblings: Fuyuhisa, Chiba Taneyori, Masaoki, Motomori, Matsura Shizume
Children: Sukemune, Seki Shinzaemon, Nakamuta Shichirōbei, Nakamuta Shinbei
Shōni Motomori served as a bushi and monk during the Sengoku and Azuchi-Momoyama periods.
In 1535, Motomori was born as the fourth son of Shōni Sukemoto, the sixteenth head of the Shōni clan.
In 1536, while under attack by Sue Okifusa, Sukemoto took his own life at Kajimine Castle. Motomori was then raised by Yokodake Sukemasa from an illegitimate branch of the Shōni clan. At the time of his coming-of-age ceremony, he received one of the characters from the name of his deceased father and adopted the name of Motomori. He resided at the Fukuman Temple in the Kawasoe manor of Hizen Province, but at this time, a former retainer of the Shōni named Imaizumi Tomokaku approached the Imperial Court to have Motomori serve as the head for a revival of the Shōni clan. Contrary to his wishes, the Imperial Court issued orders to leave Motomori alone under Ryūzōji Takanobu. Takanobu acknowledged the order and, after heading out to meet Motomori, permitted him to stay at the Fukuman Temple.
In despair after failing to achieve a revival, Motomori climbed Mount Kōya with his followers, entered the priesthood, underwent Buddhist rituals, returned to the Fukuman Temple, and became a high priest. In 1586, he died at the temple at the age of fifty-two.
Motomori had four sons but, at the Battle of Okitanawate in 1584, allied with the Ryūzōji and all of them were killed in action.