yes,Leo should stay,Mikey can't be- he's too dumb (but cute!!!) Raph can't be- he's strong but fights before he thinks and Donnie can't be too-he's very smart but not serious...so...Leo is the leader!!!
Princess2s: Lies. Leonardo is the heroic type, which fits into the leader position well. I've had to explain far too many times to people: Leo has personality. He makes his brothers laugh, he is responsible, he is dedicated, and he stays calm to protect his brothers. . . I hate to pull the fangirl thing, but it's true and someone had to say it.
Leonardo should stay the leader. Raph was bossy everyone around for no reason, Donnie would crack under pressure, and I don't think I have to explain why it shouldn't be Mikey. Leo has a a little bit of everyone in him, making him perfectly balanced.