I agree Mickey Mouse is the most iconic character, but I argue that his fame isn't from cartoons. There just aren't that many of them really. He is famous because he is the Disney mascot, not because he amused kids on his own for decades.
How many Scobby-doo shows have there been? Dozens.
There have been dozens of animated movies.
Two major studio live action films (at least one other smaller release, but could be more).
All of those things I think trump Mickey's individual creds. They both have lots of kids books, merch, and toys.