The Devil Dragon is a boss in the game I Wanna Be The Guy. It is the guardian of The Guy's Castle, and must be fought after all of the first six bosses. The Devil Dragon is based off two separate bosses from the Mega Man series. The first boss is the Mecha Dragon from Mega Man 2. The boss fight, and the boss's appearance, is primarily based off of this boss. The other boss is the Yellow Devil from the first Mega Man. The Devil Dragon has the same power trademarked by the Yellow Devil, in that it separates itself into six parts, and then moves across the screen.