Well I don't really have a favorite cartoon but I do have multiple favorite cartoons!
My Little Pony: Friendship is Magic
Green Lantern The Animated Series
Teenage Mutant Ninja Turtles
Avatar: The Legend of Korra
This is just a few of the many cartoons I love!
hmmm... that is difficult to say at least, but i might as well list the cartoons i like especially;
TMNT (all the cartoon series, like from the beginning, 2k3, and the newer one)
MLP: FiM (my cousin got me hooked on it)
Transformers (G1, Armada, you get it)
Lilo and Stitch (the series)
Tom and Jerry
My top favorites are Cow and Chicken, Tiny Toons, My Big Big Friend, Martha Speaks, Will Quack Quack, Maya the Bee, Little Bill, Rugrats, The New Adventures of Winnie the Pooh, Duck Tales, Franklin, Dora the Explorer, The Busy World of Richard Scarry, CatDog, PB&J Otter, Rocko's Modern Life, and Arthur.
My favorite cartoon shows are Archer, South Park, Rick and Steve (so sad that they discontinued it!), Daria, Drawn Together, and the Simpsons. I guess the animated TV shows I enjoy don't really speak to my AB side.
I was never really a fan of cartoons as a kid, except for Rocky and Bullwinkle, which I loved. A couple of years ago I tried watching it again. The intro sequences for each segment grated on me. That surprised me, since I really liked the intro sequences when I was little.