In addition to the style guides that others have mentioned:
Another thing that was used in traditional 2D animation was having dedicated animation teams for each character. So you had a smaller group that could really focus on animating personality into a character and make that character distinct from others in movement and expressions because the 10 (or however many) people drawing them didn’t need to learn how to animate anyone else.
Since 3D models don’t need to be redrawn every frame, it’s not as necessary these days, but some studios might still work that way
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