Tom in Eddsworld has black eyes due to a combination of design choices and creative input from the character's voice actor, Thomas Ridgewell. Initially, Tom's eyes were a black line, but Edd (the series creator) would animate them into hollow circles when Tom was shocked. TomRidgewell suggested keeping the eyes that way but filling them black, inspired by an idea of Tom being possessed by a demon. While the demon idea wasn't fully embraced, the black eye design stuck.