Toshiki Seto is a Japanese actor who began his career in live-action television and film before expanding into voice acting for anime. Born on October 7, 1995, in Chiba Prefecture, he was active as a hair model prior to launching his acting career. He became affiliated with the talent agency Ken-On and made his acting debut in 2014.

Seto is widely recognized for his extensive work in live-action productions, particularly his leading role as Hiiro Kagami, also known as Kamen Rider Brave, in the popular tokusatsu series Kamen Rider Ex-Aid, which aired from 2016 to 2017. He reprised this role in numerous subsequent films and crossover television specials. His other live-action credits include leading roles in television dramas such as Marry Me!, Cinderella is Online, and Senpai, This Can't Be Love!.

Seto made his debut as a voice actor in anime with the 2020 animated fantasy film Over the Sky, known in Japanese as Kimi wa Kanata. In this film, he provided the voice for the male lead character, Arata Kishimo, who is referred to as Shin. The film marked a significant transition in his career, representing his first role in an animated feature and his first experience with voice acting. His casting was a result of director Yoshinobu Sena specifically seeking an actor whose personal qualities matched the character of Arata. Apart from this debut role, there are no widely documented records of him taking on subsequent major characters in anime series or films.