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Otomatsu was a white-robed ANBU Captain of Konohagakure.

Invasion of Konoha
He and seven other ANBUs were stationed in the Chunin exam arena during the final rounds. When Orochimaru launched the Invasion of Konoha, Otomatsu (under the codename Raido) and his team rushed to help Hiruzen Sarutobi, the 3rd Hokage. However, before they could reach Hiruzen, the Sound Ninja Four put up a barrier and when one of Otomatsu's men touched it, he burst into flames and died, leaving Otomatsu unable to assist. He and his remaining men watched the battle between Hiruzen and Orochimaru. In the end, Hiruzen died due to using the Dead Demon Consuming Seal and Orochimaru stabbing him with the Kusanagi Sword: Long Sword of the Heavens. When Orochimaru retreated, the Captain and his men tried to stop him but Kidomaru prevented them from following with his webs. At Hiruzen's funeral, the Captain cursed at his inability to help the Hokage, saying "In the end, all we could do was watch".

Filler arcs
In the filler arcs, he and his team interrogated Naruto Uzumaki about Genno by using the Time Reversal Technique.

Part II
He died on a mission trying to find the location of one of Orochimaru's hideouts. He destroyed his body shortly after sending a bird carrier back to Konohagakure with information about his mission.