Think they also wanted to make the Mutagen's effects more "unpredictable," hence why Mutants like Splinter, the Turtles, Fishface, Mondo, and Leatherhead are pretty traditional "big animal-people without many bells and whistles" while Mutants like Pigeon Pete, Kirby Bat, Slash, Rahzar, and so on have all these extra veins and spikes and such or exaggerated features. Leaning more into why you probably shouldn't chance messing with this glowing blue alien chemical. (Case in point: Timothy.)
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