Toon Daemon is a monster card character appearing in the Yu-Gi-Oh! series, specifically as a 'Toon' version of the iconic Summoned Skull card. This character exists within the Duel Monsters card game universe, often controlled by Pegasus J. Crawford, the creator of the Toon World archetype. In the series, Toon Daemon is known for its cartoonish, mischievous appearance and special abilities, allowing it to attack opponents directly if Toon World is active, making it a formidable force in duels.