Old cartoons made me realize I have a thing for underdogs. Daffy,Tom, Wile E. Coyote, and Sylvester were all tragic protagonists in my mind.
Kinda opposite for me. I rooted for the bad guys in a lot. Like Inspector Gadget... he was an incompetent dope, his daughter Penny and that fucking dog Brain would always save the day at the last minute. I really liked Inspector Gadget show, but I pretty much hated the main character and rooted for his demise every episode.
Tom & Jerry has an interesting dynamic. There is no clear underdog. It should be Jerry, being smaller and natural prey to Tom. However, Tom is a bit incompetent while Jerry is smart and capable, which makes Tom an underdog. The show makes it pretty clear who the underdog really is, Tom, but makes you think twice about rooting for him since he sometimes does pretty devious things to eat try Jerry.