Leo. What can I say? We don't know Leo all that well; he is the de facto leader (Raph would say fearless leader) of the group. He is very deeply religious, and is probably closer to Master Splinter than any of the others. He feels a very strong sense of duty to his sensei, and cannot bear any shame. Other than that, Leo is kind of a mystery. . . the creators need to delve into his psyche more (hint hint nudge nudge.)
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