
Quick answer — Mitsuru Ogata voices Dr. Nakabachi in Steins;Gate, Atsushi Yadomi in Anohana: The Flower We Saw That Day, Honma in Kyou kara Ore wa!! and 19 more characters.
Mitsuru Ogata voices Dr. Nakabachi (Steins;Gate), Atsushi Yadomi (Anohana: The Flower We Saw That Day), Honma (Kyou kara Ore wa!!), Atsuji Tachibana (Hanasaku Iroha ~Blossoms for Tomorrow~), Wang (SAKAMOTO DAYS), Harukichi Hoshina (Star☆Twinkle Precure), Akio Hanaya (Tari Tari), Aritomo Yamagata (Rurouni Kenshin (2023)) and 14 more.
Dr. Nakabachi is voiced in Japanese by Mitsuru Ogata.