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Otto is a male octopus.
Otto is one of the residents of the ocean off the coast of Duckburg, residing in a pirate shipwreck. Otto was befriended by Donald Duck in 2003, during the period of his life when Donald was forced to lived underwater due to having ingested too many of Gyro Gearloose's Aqua-Pills.
Otto, who displayed a fondness for playing cards with Donald, soon became Donald's closest friend in the thriving underwater community, although during their submarine visits to check up on Donald, Huey, Dewey and Louie Duck and Gyro Gearloose refused to believe that beings such as swordfish and octopuses were in fact sentient. Otto even saved Donald's life during his first encounter with the shark Smiley.
After Donald, Otto and many other sea-dwellers were nabbed by Sharky Smith's Ocean Sweeper, Otto was instrumental in the escape plan (which ended up even sinking Sharky's ship altogether), and, after the Aqua-Pills finally wore off, Otto helped carry Donald back to shore, bringing him the treasure hidden inside his shipwreck home.
Behind the scenes
Otto is one of the main one-off characters in the 2003 comic story Merman Donald.