The same is true for Mabel Pines, and her neck isn’t the only problem—I’m pretty sure those legs wouldn’t carry her weight. Speaking of which, I consider it a miracle that Doctor Eggman can stand at all. His slender needle-legs wouldn’t hold up his mustache, let alone his, um, bulbous physique.
Yes, I’m overthinking things. Cartoons aren’t supposed to be realistic. Character designs are highly stylized. I get that, and I like cartoony proportions. (Would Snoopy from Peanuts be one-half as adorable with a proportionately-sized head? I didn’t think so.) All the same, I find myself occasionally scrutinizing cartoon characters and wondering which bones would be the first to break.
Consider the following image of Charlie Brown, courtesy of Michael Paulus.
I suppose cartoon anatomy joins the ability to pull stuff from nowhere as one of animation’s greatest mysteries.