Ryutaro Okada is a Japanese actor born on December 27, 1993, in Nishinomiya, Hyogo Prefecture, Japan. His professional activities include both live-action performance and voice acting. He is known for his skills in skiing and tennis.

Okada is best known for his portrayal of Isamu Fuwa, a primary character in the Kamen Rider Zero-One franchise. He first played this role in the 2019 television series Kamen Rider Zero-One, appearing in all 45 episodes as the character and his transformed identity, Kamen Rider Vulcan.

The specific voice acting role you mentioned is that of Isamu Fuwa in the 2020 short anime series Kamen Rider Zero-One Short Anime: Everyone's Daily Life. In this animated production, he provided the voice for the character across all five episodes. This project is a notable entry in his career as it represents a transition of his live-action character into an animated format with his voice performance.

Beyond this short anime, his work in the Kamen Rider Zero-One universe is extensive. He reprised the role of Isamu Fuwa in multiple film and video releases, including the 2020 theatrical film Kamen Rider Zero-One: Real Time, the 2020 special Kamen Rider Zero-One: Final Stage, the 2021 video releases Zero-One Others: Kamen Rider Vulcan & Valkyrie and Zero-One Others: Kamen Rider Metsuboujinrai, as well as several other DVD-exclusive specials and web series. His filmography from this period lists him primarily as an actor, with the short anime being one of his few credited voice-only performances.