Disney has Morty Mouse, with squarish ears.... you can see the resemblance to Mickey, though. ISTR reading that Morty was a name he'd been playing with. The Marx Brothers are obviously alive and well, considering all of the references to Groucho.
Makes me wonder what Bugs Bunny looks like in this world. Bugs, apart from the Brooklyn accent, was modeled in large part after Groucho, and IIRC even imitated Groucho in at least a couple of cartoons. Foghorn Leghorn was a direct imitation of the Senator Claghorn character on the Fred Allen radio show.
Speaking of which....
Is Benjamin Kubelsky a violin virtuoso, or did he follow his muse into comedy? Did William Claude Dukenfield stick with juggling and magic tricks, or did he also take the jump into comedy?
Enquiring minds want to know!