Leonardo (or Leo), a fictional character, is one of the Teenage Mutant Ninja Turtles (TMNT). His bandana is blue, his favorite color (although originally all four Turtles had red bandanas) and his weapons are two ninjaken (literally ninja sword ), although every incarnation incorrectly identifies his swords as katana. He is named after Leonardo da Vinci. He is considered to be the best fighter in group.Leonardo takes after his sensei, Splinter, in taking Ninjutsu very seriously. As the eldest of the four turtles, he is the closest to Splinter and spends much of his free time in practice and meditation. He has a strong sense of honor, and is a strict follower of the Bushido code. He tries to keep his brothers in line and often has the leading role in the characters' adventures.