Robbie Rotten wears a navy blue shirt with a purple vest with dark red stripes. He also wears a belt and formal shoes. Robbie has black hair as well as grey eyes. In the song Master of Disguise, he claims to be slimy and be able to disguise as anything, such as Sportacus, a pirate, an old lady and "a scary Dinosaur with a loud ferocious roar". He is very tall and skinny. He also wears blue socks with red stripes.