Atsushi Imaruoka is a Japanese voice actor born on May 23, 1972, in Isesaki City, Gunma Prefecture. He is affiliated with the talent agency Mausu Promotion. His path to voice acting is notable for his previous career as a professional boxer.

Before entering the voice acting industry, Imaruoka was an amateur boxer in high school. After graduating, he moved to Tokyo with the ambition of becoming an actor but continued boxing to maintain his physique. This led to him obtaining a professional boxing license at the age of 24, and he competed professionally for three years before retiring at 27 to refocus on his original goal of acting. In 2001, he enrolled in the Mausu Promotion Actor Training School, and after two years, he officially joined the agency in 2003, marking the start of his full-time voice acting career.

Imaruoka is known for his deep and expressive voice, which he often uses to portray a wide range of characters, from delinquents, tough guys, and middle-aged men to monsters and villains. He has noted that he was frequently cast in such roles before having the opportunity to play more conventional handsome characters. His distinctive vocal style sometimes incorporates falsetto into his shouting, adding a unique texture to his performances.

His career features a long list of anime roles, demonstrating his versatility. The user provided many examples of his work, which are verified across multiple sources:
Yamamori in Tokyo 24th Ward
Gantetsu Suzunone in Shinobi no Ittoki
Kōji Matsushita in Salaryman's Club
Tadashi Shiroyama in Captain Tsubasa (2018)
Jack in AFTERLOST
Kiyohara in Chūko Video-Ya no Onna Tenin X
Daiki Kurosaki in Encouragement of Climb Season 3 (credited as Suu-san)
Claugh Klom in The Legend of the Legendary Heroes
Detective Ankokuji / Yamitarō Ankokuji in Mazinger Edition Z: The Impact!
Burio (Michishio Nagasumi's father) in My Bride is a Mermaid
Goredolf Musik in the Fate/Grand Order franchise
Glooder in Wonder Momo
Judōra in Sanjōgattai Transformers Go!
Joel Murphy and Modok in Marvel Disk Wars: The Avengers

Beyond these, he has voiced numerous other significant characters. He is perhaps best known for his portrayal of the passionate Nazi officer Rudol von Stroheim in JoJo's Bizarre Adventure, a role that significantly raised his profile. He was already a fan of the original manga before being cast and has shared stories about the pressure and dedication he felt preparing for the part. His other prominent roles include Dallas Genoard in Baccano!, the ninja Jimushi Jūbei in Basilisk, the snake slayer mage Cobra in Fairy Tail, Demikas in Log Horizon, and Ran Izumii in Durarara!!. He has also made appearances in long-running series such as One Piece and Naruto.

Imaruoka's career also extends to video games and dubbing foreign productions. He is the Japanese voice of Winston in the popular game Overwatch and has contributed to games like Fire Emblem and JoJo's Bizarre Adventure: All Star Battle. His work in dubbing includes roles in films and TV series.

Throughout his career, he has maintained a connection to his roots, speaking the Joshu dialect of his home prefecture as a hobby. Boxing remains a personal interest and a skill that has shaped his disciplined approach to his profession.