Fionn Kinsella is an anime voice actor known for their work in the English-language dub of the fantasy anime series Seirei Gensouki - Spirit Chronicles. In this series, Kinsella provides the voice for the younger version of the protagonist, Rio, who is also known by his past life name, Haruto Amakawa. This role encompasses the character's childhood scenes and flashbacks across both the first and second seasons of the anime.

Kinsella's portrayal of young Haruto marks their entry into the field of anime voice acting, with Seirei Gensouki - Spirit Chronicles being cited as their debut anime role. The English dub for the series, including Kinsella's performance, was initially produced by Iyuno-SDI, with casting directed by Brittany Lauda. For the second season, which premiered in 2024, the dub production moved to Crunchyroll's in-house studio in Dallas, where Kinsella returned to reprise the role of the young Haruto. The voice direction for the second season was handled by Shawn Gann. To date, Kinsella's work as the young protagonist in Seirei Gensouki - Spirit Chronicles remains their primary and most documented credit in the anime industry.