Leo is a red-eared slider turtle, he looks very feminine and his full name is Leonardo Hamato, he is in the Hamato clan run by his older brother Raphael, his younger brother is Michelangelo and his (other) older brother is his twin who's named Donatello, Raph and Donnie are protective of the younger two but they all are still protective of eachother. Their enemy is Usagi, who wants to avenge his clan and kill off the Hamatos. Many people call Leo a girl when they first meet him