Mitsuru Fujimori (藤森 みつる,Fujimori Mitsuru) is a young boy who appeared a month after Mukuro's defeat during the Kokuyo Arc. He was at Yamamoto's baseball game because his older brother was playing too. He was possessed by Mukuro. Tsuna felt Mukuro's presence because of his Hyper Intuition but thought that it was just his imagination, while Reborn not only noticed Mukuro, but also said that it must be tough to be alone like that and that he would take him on anytime. He has not appeared again since then in the manga or anime, but he was mentioned in the Vongola 77 character book.