Leonardo is the eldest brother and the leader of the group. He is the most skilled, the most serious, the most spiritual, the most mature, the most disciplined, and in line with Splinter's teachings and thoughts. Like all of the brothers, he is named after an Italian Renaissance artist, in this case, Leonardo da Vinci. Leonardo da Vinci is widely considered the most diversely skilled individual of the Renaissance period, and as such, Leonardo is also considered the most diversely skilled ninja turtle.