Kosuke Miyoshi is a Japanese voice actor born on July 10, 1992, in Kanagawa Prefecture, Japan. He began his path toward a career in voice acting in 2006 when he entered the Himawari Theatre Group's Yokohama Extension Studio. He later enrolled in the Mouse Promotion Acting School in 2012 and officially became a member of the agency in 2014.

Miyoshi made his professional debut with a starring role as Delta Lantanoir in the video game Ar nosurge: Ode to an Unborn Star in 2014. His most prominent and enduring role in anime is as Mashirao Ojiro, also known as Tailman, in the long-running and popular series My Hero Academia. He has voiced this character across all seasons of the television anime, as well as in the franchise's movies, including My Hero Academia: Heroes Rising and My Hero Academia: You're Next. His other anime credits include roles in Gundam Build Fighters Try as Yoshiki Uzuki, The Lost Village as Jack, and Hypnosis Mic: Division Rap Battle - Rhyme Anima as Kazuyo Rurugawa. He has also contributed voices to numerous other series in supporting and guest roles, such as in Tales of Zestiria the X, God Eater, and 2.43: Seiin High School Boys Volleyball Team.

In addition to his work in anime, Miyoshi has been active in video games, lending his voice to titles like the My Hero Academia games, Shadowverse, and Brave Frontier Resonance. His work also extends to drama CDs, including BLCD, and dubbing for foreign films and dramas.

In 2020, Miyoshi left Mouse Promotion and worked as a freelance voice actor for a period. In April 2021, he joined the agency Al-Share. He is known for his energetic performances and has a variety of interests, including gaming, reading, and studying history and mythology. He also holds a second-degree certificate in calligraphy.