Otto was one of the longest-serving members of the Black Company, from before the start of the series to just one year before Soldiers Live. He is rarely seen without his fellow Company member and eternal sidekick Hagop. Otto, like Hagop, is well known for surviving every fight he gets into but always receiving at least a minor wound.
Otto and Hagop are originally from Rebosa, a city to the south of Beryl on the Southern Continent. He played an important role in the death of Raker in Roses. He and Hagop were out drinking when Raker, for unknown reasons, blew his cover and stabbed Otto. Hagop ran back to the Company's apartment, where he told Croaker and Raven what happened. Those two proceeded to track Raker through the city and kill him.
Otto was one of the original Company soldiers who sailed aboard the imperial flagship, The Dark Wings, from Beryl, across the Sea of Torments, to Opal, in The Black Company. Years later, in Shadow Games, he would be one of the only 5 survivors to make the return trip aboard the same vessel.