Takaki Ōtomari is a Japanese male voice actor affiliated with the agency Mausu Promotion. He was born on October 28 in Toyama Prefecture. He began his path to the profession by graduating from Tokyo Announcement College in 2013, after which he entered the Mausu Promotion affiliated actor training school. He has been a member of Mausu Promotion since 2015, marking the start of his professional voice acting career.

Ōtomari has built a career predominantly through supporting and background roles across a wide spectrum of anime television series. His filmography demonstrates consistent work since the mid-2010s, with appearances in productions such as NARUTO - Naruto Shippuden, Joker Game, and the various entries in the JoJo's Bizarre Adventure franchise, including Golden Wind and Stone Ocean. He has also been a part of popular series like Lycoris Recoil, The Rising of the Shield Hero, and Undead Girl Murder Farce. In 2021, he voiced the character of the Great Sage in the series The Hidden Dungeon Only I Can Enter.

Beyond television, his voice can be heard in original net animations (ONAs) such as the second season of Ghost in the Shell: SAC_2045 and the science fiction series Japan Sinks: 2020. He has also contributed to several theatrical anime films, including Penguin Highway, the science fiction film Hi-Evolution 1, and the romantic drama Ride Your Wave. In the realm of video games, Ōtomari is known for his performance as the character Raphael Kirsten in the tactical role-playing game Fire Emblem: Three Houses. His other game credits include Astral Chain, White Cat Project, and Quiz RPG: The World of Mystic Wiz.

A notable aspect of his professional profile is his consistent association with Mausu Promotion, his agency since his debut. His work often places him among a recurring circle of fellow voice actors, with frequent collaborations including performers like Yuichi Nakamura, Daisuke Hirakawa, and Showtaro Morikubo. Information regarding his personal interests highlights a unique combination of skills and hobbies, which he has listed as being able to replicate the breathing of Darth Vader, cooking, and watching and listening to the character Funassyi.