Don. Because he was the techhead, and I always tend to like the smart, scientific guys. Those tend to be my favorites, and the ones I'm most like.

Don, for the same reasons as Crazy Jetty listed above.

Though my actual favorite as a kid was Raph. He was just as skilled as Leo, but lost his temper from time to time.

So, in terms of personality, Raph + Don = me as a kid.

Mike is a party animal who likes comic books and tells bad jokes.