As a school kid I use to watch Tom and Jerry.I am really fond of watching them even after finishing my college.
good call, I love those guys...you know the old Disney ones not the bastardized 'new' versions you see on the Disney channel.
I guess this has already been discussed quite a lot of times Jerry, Bunny (Bugs Bunny) are my favorites.
Are Anime characters included. If they are, then Naruto would be my favorite. If not then it would have to be good old Bugs Bunny.