Character design Fictional character Dark knight Comic character Ninja Turtles Comic art Book character Mutant ninja Comic book character Teenage Turtles Teenage Ninja Turtles Character portrait Dark background Book art Comic book art Teenage Mutant Intense expression Ninja turtle Center stage Mutant turtles Teenage mutant turtles Mutant Ninja Turtles Masked figure Teenage Ninja Teenage Mutant Ninja Red mask Various media Masked character Iconic mask Turtles franchise