Robbie Rotten is a character in the TV show LazyTown who, desiring silence and peace, continuously formulates feckless schemes that often feature him masquerading in various disguises as a means of hoodwinking or tempting residents away from an active lifestyle. He passionately abhors the influence of Sportacus and Stephanie, and a number of these schemes are intended either to do away with them or lure the people of town away from a fit lifestyle. Ironically, his attempts to promote physical inactivity often require considerable effort and force him to become more active. Robbie is famous for performing the song 'We Are Number One' along with Bobby, Tobby and Flobby Rotten.

He had his own role on the Discord instead of Mr Rental for a few days.