Shunsuke Takeuchi is a Japanese voice actor and singer affiliated with the agency 81 Produce. He was born on September 12, 1997, in Tokyo. Takeuchi began his career in 2013 and gained widespread recognition early on. In 2016, he was awarded the Best Rookie Actor award at the 10th Seiyu Awards, an honor he shared with fellow voice actors Yuichiro Umehara and Ayumu Murase.

Takeuchi's voice is notably deep and mature, a characteristic that allowed him to land significant roles from a young age. His breakthrough role came in 2015 while he was still in high school, when he was cast as the Producer in the popular anime adaptation of The Idolmaster Cinderella Girls. This performance became a signature role, and he is often affectionately referred to as "Takeuchi P" by fans.

He has built a diverse portfolio of characters across many anime series. He is known for roles such as Revolver in Yu-Gi-Oh! VRAINS, Chiron in Fate/Apocrypha, Zack Walker in Astra Lost in Space, and Brawler in Akudama Drive. He also voices Gonta Gokuhara in the game Danganronpa V3: Killing Harmony. More recently, he has taken on prominent roles in major productions, including Askin Nakk Le Vaar in Bleach: Thousand-Year Blood War, Einar in Vinland Saga Season 2, Aoi Kaguragi in Kaiju No. 8, and Nagisa Akutsu in Aoashi. He is frequently cast as strong, muscular, or mature characters, a trend fans have observed throughout his career.

In addition to voice acting, Takeuchi is also a singer and musician. He forms the musical duo Amadeus with rapper Lotus Juice. For his music production, he uses the stage name Jack Westwood. He announced his marriage to film director Misato Kato in September 2022.