His name can also be romanized as Ōtomo Ryūzaburō. He is a Japanese seiyū and actor from Tokyo. He is currently affiliated with Aoni Production as of December 2006, and was formerly affiliated with 81 Produce and the Tokyo Actor's Consumer's Cooperative Society. Possessing a low voice and shrill laugh, Ōtomo often voices characters who are either calm, violent, treacherous, or sneaky, examples including the sorcerer Lord Giri in Mahōjin Guru Guru and Jūsan Saejima in Brave Police J-Decker. He took over the ongoing roles of seiyūs Shigezō Sasaoka and Eiji Kanie after their deaths. In addition, he took over for Shinji Nakae as the narrator of variety show Hey! Spring of Trivia as of May 12, 2007. He is 186 centimeters (6 feet, 2 inches) tall, and his blood type is A.