Otonoshin Koito is a prominent character in the anime and manga series Golden Kamuy. He serves as a second lieutenant in the 7th Division of the Imperial Japanese Army and is the son of a high-ranking naval officer. Koito is known for his youthful exuberance, sophisticated upbringing, and admiration for Lieutenant Tsurumi. Throughout the series, he demonstrates loyalty, intelligence, and skill in combat, playing a significant role in the search for the hidden Ainu gold alongside the other members of the 7th Division.