Takahide Ishii, a native of Ibaraki Prefecture, was born on 3 June.[1] He fell in love with anime after watching The Law of Ueki as an elementary school sixth grade student.[2] He was initially interested in stock trading and becoming an illustrator, but decided to go into voice acting after his sister took him to see a musical and after being impressed by Mamoru Miyano's first live performance, where her mother took him to after someone she knew was invited to be a backup dancer there.[2][3] He was educated at Tokyo Announce Gakuin [ja].[4] In 2013, he passed the 7th Seiyu Awards New Voice Actor Discovery Auditions.[5]
In 2018, he starred as Nanao Wakura in Cute High Earth Defense Club Happy Kiss and Junpei Shirayama in Dimension High School,[6][7] and he performed "Here We Go!", the anime's opening theme, as part of the tie-in unit 4 Dimensions.[8] In 2022, he starred as Ryosuke Minase in the Futsal Boys!!!!! anime,[9] and he performed "Higher Goals", the theme song for their game Futsal Boys!!!!! High-Five League', alongside the other twenty-eight main cast members.[10] In 2024, he was cast as Tarō J. Suzuki in Delusional Monthly Magazine and Tomoatsu Naoe in Plus-Sized Elf.[11][12]
Ishii lists fighting games and first-person shooters as his hobbies.[1] He began gaming while he was three and once broke his arm, which left him in a cast while holding onto a controller.[2] At the time, his parents were surprised by his interest in games.[2]