The Ninja is an easter egg character from the game Terraria (2011). He is visible stuck within the gooey blue body of the easiest boss in the game, the King Slime, and items of his clothing have a chance to drop upon said boss' slaying. While the Ninja is not an NPC character that can be interacted with, developer Redigit has stated that the character is the corpse of The Guide's brother, killed in combat with King Slime prior to the Terrarian's arrival.