Hiiro Ishibashi is a Japanese voice actor and singer affiliated with Avex Pictures, who was born in Chiba Prefecture on August 24, 2004. His career in the entertainment industry began at a young age; he started taking vocal and dance lessons at the Avex Academy Tokyo when he was four years old. In 2015, he gained early recognition by winning the grand prize in the singing category at Avex's Kira Challenge talent competition. He also has experience as a rapper, appearing in a 2016 commercial for Dai-ichi Life.

Ishibashi made his voice acting debut in 2018 with a high-profile role, providing the Japanese dub voice for the main character, Miguel Rivera, in the Disney/Pixar film Coco. His first role in a theatrical anime film came in 2019 when he voiced the character Umi in Studio 4°C's Children of the Sea. He made his television anime debut in 2020 as the protagonist Yuga Ohdo in Yu-Gi-Oh! Sevens, a role that significantly raised his profile.

Since his debut, Ishibashi has built a filmography primarily centered on young, energetic male protagonists. Following his lead role in Yu-Gi-Oh! Sevens, he has taken on main roles in several subsequent anime series. In 2024, he starred as Akatsuki Red in Mr. Villain's Day Off and as Taisei Onari in Shinkalion: Change the World. The same year, he also voiced Hinata Aozora in Himitsu no AiPri and Henri Nobel III in The Prince of Tennis II: U-17 World Cup Semifinal. His role as Ryo in the 2025 Pokémon web short Hikozaru to Shinmai Pokémon Kenkyuin further demonstrates his continued presence in prominent franchises. He is also set to voice the character Gai in the upcoming 2026 anime sequel Yoroi Shin Den Samurai Troopers.

In addition to his voice acting, Ishibashi is an active singer. His musical work includes original singles such as "Himawari" and "NeverEndingSummer" in 2020, as well as "Mirai" in 2021. He has also performed numerous character songs for the series in which he has appeared, including insert songs for Coco and the ending theme for Yu-Gi-Oh! Sevens. He regularly holds live concerts and birthday events, and he established his official fan club, HimawaRing, in 2019.

Ishibashi's talent was recognized early in his career with the Newcomer Award at the 19th Seiyu Awards in 2025. His work is frequently associated with his talent agency, Avex Pictures, and he has had recurring roles within the Yu-Gi-Oh! franchise, reprising his character Yuga Ohdo in the subsequent series Yu-Gi-Oh! Go Rush!! in 2022 and in the game Yu-Gi-Oh! Duel Links.