Kouhei Takeda is a Japanese actor and voice actor born on January 14, 1986, in Tokyo. He began his entertainment career in the early 2000s, winning the Jury Special Award at the 14th Junon Superboy Contest in 2001. While he is widely recognized for his extensive work in live-action television and film, particularly in the tokusatsu genre, he has also built a notable body of work as a voice actor.

Takeda is known for his performances in popular Kamen Rider series. He portrayed Red Otoya in Kamen Rider Kiva, who later becomes Masked Rider Ixa and Dark Kiva, a role he also voiced in the series' film adaptations and reprised in Kamen Rider Decade. In Kamen Rider Build, he played Kazumi Sawatari, also known as Kamen Rider Grease. In the realm of voice acting for video games, Takeda is best known as the voice of Vaan, the protagonist of Final Fantasy XII, a role that also involved motion capture performance. He has also voiced Vaan in subsequent related titles, such as the rhythm game Theatrhythm Final Fantasy Curtain Call.

His early work in the tokusatsu genre includes one of the key roles specified in the query: he played Ken Shido, the human identity of Sazer-Lion, a fire-aligned warrior from the Flame Tribe in the 2003 Toho series Chōseishin GranSazer. This role marked an early appearance in a superhero franchise. His career includes a mix of on-screen performances and voice work, with his role in Final Fantasy XII representing a significant international credit. Takeda's filmography shows a consistent presence in Japanese television dramas from the 2000s to the present day, but his most prominent voice acting achievements remain centered on his work in the Kamen Rider franchise and his leading role in the Final Fantasy video game series.