|PERFORMER||Martin P. Robinson|
He first appears in Episode 2538 as a group of Grouches (including Velma and Worby) experiencing the life on Sesame Street through a tour hosted by Oscar the Grouch. He is armed with his camera, taking pictures of their various experiences.
- In the 1976 book How to Be a Grouch, Oscar has a baby brother named Otto.
- other characters named Otto