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A good number of gen 1 Pokemon have the following traits (sometimes even any number of combinations of them)
>triangular cat ears
>weird slabs of flesh on their limbs
>those triangular anime eyes
I feel like these traits in general seem more prevalent in gen 1 than any other trait.
Design wise, a good number of Pokemon in gen 1 are a lot more ambiguous and fictional; there's definitely less Pokemon based on specific things as opposed to Pokemon that are just made-up creatures than there are in later generations.
I actually kinda miss this; Pokemon that are more conceptual than specific, you know? Guys like Abra, Slowpoke, Chansey, Snorlax, Shuckle, Magmar, Electivire, Exploud, Aromatisse, etc. I mean, I love when Pokemon gets super specific, but I DO miss the "kind of like this animal but not really" Pokemon.
Also, please note that I am not stating any disparagement for anything.