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Leonardo, nicknamed Leo, is a fictional character appearing in Teenage Mutant Ninja Turtles comics and related media, and created by American comic book artists, Kevin Eastman and Peter Laird. He is one of the four central characters of the franchise, along with his brothers, Donatello, Raphael and Michelangelo. Often depicted wearing a blue bandanna, his signature weapons are two katana. In most iterations, Leonardo is portrayed as the leader, as well as the most mature and disciplined of the Turtles. Like his brothers, he is named after an Italian Renaissance artist, in this case, Leonardo da Vinci. In the original comics, all four of the Turtles wear red masks, but for the creators to tell them apart, he was written and redrawn to have an ocean-blue mask.