Tortoise Matsumoto (トータス松本 Tōtasu Matsumoto, born December 28, 1966 as 松本敦 Atsushi Matsumoto) is the lead singer of the Japanese guitar group, Ulfuls. He has also had a couple of acting roles in TV dramas, starting with Namida o Fuite (涙をふいて) in 2000. 　　Trigun character Nicholas D. Wolfwood is modeled after him. 　　On July 11, 2018 it was announced via a press conference video that Tortoise Matsumoto, Kazuyoshi Saito, Tamio Okuda, Takashi Hamazaki, Yohito Teraoka and YO-KING have formed a musician supergroup, the "Curling Sitones" (カーリングシトーンズ, Kāringu Shitōnzu).