Otto is Ariel's Sea Otter pup.
A light cyan otter with large blue eyes and a tan muzzle to match his inner-ear and chest. He has a big brown nose. His white and black hat has a red design on the corner to match the red and white ribbon on his tail and the collar he wears.
While she was singing, Ariel suddenly heard another voice join in on the song. Down in the water was an adorable Otter Pup named Otto.