Yōhei Tadano is a Japanese actor and voice actor born on March 10, 1962, in Fukuoka Prefecture, Japan. He is affiliated with the theatre company Theatre Echo and has been active in the entertainment industry since 1985. His interest in acting began during his elementary school years, and he later pursued this passion at the University of the Ryukyus, where he joined a local theater group. After graduating, he worked various jobs, including as a salesman, before moving to Tokyo to focus on acting. He joined the Theatre Echo Training Institute in 1988, became a research student, was named a troupe member in April 1994, and received a promotion in April 2000. On February 27, 2019, he was appointed as a tourism ambassador for his hometown of Kitakyushu City.

Tadano's voice-over career began in 1993 with the Japanese-language dubbing of the American film The Saint of Fort Washington. While dubbing assignments for Western movies continued for some time, he expanded into anime work in 2006, with his first role in the series Hime-sama Goyojin. His voice has been described as sharing similarities with the late Yasuo Yamada, a senior member of his theater troupe, which has led to Tadano frequently substituting for Yamada in various roles. Notably, he has taken over as the Japanese dubbing voice for actor Clint Eastwood, a role for which Yamada had been famous. Additionally, following the passing of Ichirō Nagai in 2014, Tadano was called upon to assume Nagai's role of Yoda in Star Wars Rebels. He also replaced Kaneta Kimotsuki as the voice of Jiminy Cricket in the video game Kingdom Hearts III and has served as a replacement for the late Takeshi Aono in several roles.

Tadano portrays a wide range of characters, from young to old, and is known for his versatility, often lending his voice to comical villains, small animals, and eccentric figures. His extensive anime filmography includes the role of Leslie in Hime-sama Goyojin. He has voiced Shigemori Sumimura in Kekkaishi, Miyagi in Megalobox, and Professor Shikishima in Getter Robo Arc. He appears as Kudō in Great Pretender, Giuliano Flip in BNA: Brand New Animal, and Beduck in Dragon Quest: The Adventure of Dai. In children's anime, he is known as Professor Ochanomizu in Go Astro Boy Go!. He also voiced the character Sebastian in Yu-Gi-Oh! Sevens, Ed in Make My Day, Darjeeling Aspoirot in Layton Mystery Tanteisha: Katori no Nazotoki File, and Shigemori Sumimura in Kekkaishi. Additional roles include Flyseyes in Castlevania, Chop Shop in Transformers: Robots in Disguise, and Kōji Noto in Psycho-Pass: Sinners of the System. He voices the character Yoshimura in DIGIMON BEATBREAK, Jūzō Unno in Cat's Eye, and Dr. Vegapunk in the long-running series One Piece. He is also the voice of Rick Sanchez in the Japanese-language version of Rick and Morty: The Anime, a role he has also played in various related animated specials. Beyond anime, his dubbing work includes characters such as Heinz Doofenshmirtz in Phineas and Ferb, King Candy in Wreck-It Ralph, and Stannis Baratheon in Game of Thrones.

In the world of video games, Tadano has contributed his voice to numerous major titles. He is known for the role of Gen in Street Fighter IV and Street Fighter V, Don Corneo in Final Fantasy VII Remake, and Nonomiya in Yakuza: Like a Dragon. He also voiced Ryuzo in Ghost of Tsushima, King Felnorc in Dragon Quest Heroes II, and Kanbei Kuroda and Muramasa Senji in Nioh. His other game credits include Jiminy Cricket in Kingdom Hearts III, Hugo in Shin Megami Tensei IV, and Abull in Ni no Kuni: Wrath of the White Witch.