Toshiki Masuda, also known as Massuu (まっすー), is a Japanese seiyuu and musical performer from Hiroshima Prefecture, Japan. Born on March 8, 1990, he is signed to Toy's Factory and works across voice acting, character songs, stage performances, and the broader anison and multimedia-idol scene. Fans often search for his profile details, including his 176 cm height, 62 kg weight, blood type B, and Hiroshima hometown.
In stage performance, Masuda played Yukimura Seiichi until the end of season one in TeniMyu Dream Live 7th as part of Rikkai B. In 2012, he formed the singing unit MaxBoys with fellow seiyuu Yoshimasa Hosoya to support his seiyuu debut, and the unit disbanded a year later. He is also part of Marginal#4 with KENN, Naozumi Takahashi, and Yuuto Suzuki, where his character is Atom Kirihara. More recently, he appeared in the 2026 music reading drama Ashigirl and was interviewed about Yoroi-Shinden Samurai Troopers, reinforcing his presence in anime-related performance projects.
