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Otomatsu was a white-robed ANBU captain from Konohagakure. He usually went under the codename Raido.

Invasion of Konoha
Otomatsu and seven other ANBU members were stationed in the Chunin exam arena during the final rounds of the Chunin exam. When Orochimaru launched the Invasion of Konoha, Otomatsu and his team rushed to help Hiruzen Sarutobi, the Third 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 the ANBU Captain unable to assist. He and his remaining men were forced to watch 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, Otomatsu and his men tried to prevent them from escaping, 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".

The Return of Genno
In the Genno filler arc, Otomatsu and his team interrogated Naruto about Genno by using the Time Reversal Technique.

Fire Temple
Otomatsu's squad was sent out three years later along with many other ANBUs to capture Danzo and Tatsuji, a ninja spy from Amegakure. Later, Otomatsu and his men were seen escorting Danzo and Tatsuji to Konoha's interigation center.

Three-Tails Arrival arc
He died at the hands of Kabuto on a mission trying to find the location of one of Orochimaru's hideouts. Otomatsu then destroyed his body shortly after sending a bird carrier back to Konoha with information about his mission.

Trivia

 * Strangely enough, Otomatsu also seems to appear later during Pain's invasion of Konoha with Shizune, Ino, and Inoichi (although it may be a different person in the same attire). He also appears on the box art for Naruto: Clash of Ninja Revolution 2 (despite not having any importance in the story). However, since Otomatsu's death occured in a filler arc, it can be said that his death was not canon and he's still alive.