Ōtomo Ryūzaburō is a Japanese seiyuu and actor from Tokyo who has been affiliated with Aoni Production since December 2006. He was previously associated with 81 Produce and the Tokyo Actors Consumers Cooperative Society. His voice is low, but he also emits a shrill laugh. Ootomo often portrays characters that are calm, violent, treacherous or sneaky in his roles, such as Lord Giri from Mahoujin Guru Guru and Juusan Saejima from Brave Police J-Decker. He assumed the seiyuu roles of Shigezou Sasaoka and Eiji Kanie after their deaths. Furthermore, he replaced Shinji Nakae as the narrator for Hey! Spring of Trivia starting May 12, 2007. Ootomo stands at a height of 186 centimeters (6 feet, 2 inches) and his blood type is A.