I’m a sucker for watching a character visually evolve over time. It’s almost like looking at alternate lives that a fictional character could’ve embodied with slightly different personalities. For example, you can see how Spryo the Dragon seemed to have an entirely different attitude in these early designs
https://kotaku.com/see-how-spyro-the-dragon-evolved-in-these-early-sketche-5911462
And though the movie’s not quite out yet, you can see how the main character of the video game-centric feature film Wreck-It Ralph started out as more of a monster in this series of images released by Disney. I’m guessing that the prevailing wisdom argued that a more creature-like Ralph would have been harder to be sympathetic to. Who knows? Ralph’s final Lil’ Abner/Mario look works just fine, but I sure like the different illustrative styles that he journeyed through.
https://kotaku.com/wreck-it-ralph-really-looks-like-it-might-be-toy-story-5942742