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The difference with Blaziken and newer starters is that Blaziken's base inspiration was already a biped fighting creature, so they took that and added more elements to create a unique design. Is the result humanoid? Yeah, but it has a reason to it, it makes sense, it's the culmination of several design elements. Newer starters on the other hand are just "so uh, what if we had a chameleon and a rabbit.. but they stand up and do wacky things? xD"