DiC made most of the Nintendo characters look different. For example, in all Super Mario Bros. series (SMBSS, AOSMB3, SMW) King Koopa is rarely ever called Bowser, he's bald, wears a crown, has no tan or orange scales, (unless you count the underside), has only five horns on his back shell. The princess's hair is darker (possibly to compare to the limited colors the early video games could display), has not arm length gloves, her crown does not have jewels. Toad's head is only half a sphere. Yoshi looks different in many episodes of Super Mario World, and he is usually dark green. The Koopa Kids all have different names, and look vastly different from the games.
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