Tsuyoshi Kusanagi is a Japanese entertainer whose primary career is as an actor, singer, and television host, with voice acting representing a smaller facet of his extensive body of work. Born on July 9, 1974, in Ehime, Japan, and raised in Saitama, he rose to national fame as a member of the influential boy band SMAP from its formation in 1988 until the group's disbandment in 2016. Throughout his career, he has maintained a parallel path as a celebrated actor in live-action film and television.

In the realm of anime and voice work, Kusanagi has taken on select, notable roles. One of his earliest voice acting credits is in the 1995 Japanese animated film The Diary of Anne Frank (Anne no Nikki), where he voiced the character Peter Van Daan, the teenage boy also hiding in the Secret Annex. Decades later, he took on the lead role of Angelino in the 2018 Japanese-dubbed version of the French-Japanese animated science fiction film Mutafukaz (MFKZ). In this film, he voices the protagonist, a young man living in a gritty metropolis who discovers his reality is not what it seems. His other voice work includes providing the Japanese-dubbed voice for the lead character Rodney in the 2005 animated film Robots and for Hal in the 2007 film Strings.

His career is marked by a long-standing association with the talent agency Johnny & Associates as a member of SMAP and, subsequently, with the agency CULEN. His contributions to entertainment have been recognized with numerous awards for his live-action acting, such as the Drama Academy Award for Best Actor for his role in the 1997 television drama Ii Hito. However, his work specifically as a voice actor is not widely documented as a separate, specialized career path, but rather as an extension of his broader acting work within specific projects.