(Donnie or Don) – The scientist, inventor, engineer, and technological genius, Donatello wears a purple mask and wields a bo staff. Donatello is perhaps the least violent turtle, preferring to use his knowledge to solve conflicts, but never hesitates to defend his brothers. He is named after the early Renaissance Italian artist and sculptor from Florence, Donatello. Leonardo (Leo) – The tactical, courageous leader and devoted student of his sensei, Leonardo wears a blue mask and wields two katana. As the most conscientious of the four, he often bears the burden of responsibility for his brothers, which commonly leads to conflict with Raphael. Leonardo was named after the Italian polymath, painter, engineer, inventor, writer, anatomist, and sculptor, Leonardo da Vinci.