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Gengar has always had radically more threatening or more goofy depictions based on the specific media in question.
The only time he's looked particularly cool looking is in the GSC sprites and the one old R/B sugimori art
anyways pokemon design autism with proportions and shit is one of my favorite topics, but i'm busy. I'll point to blastoise: Looked super cool in the Blue Cover art, and the GSC and RSE/FRLG sprites, where he has fangs, a bulkier lower jaw, longer limbs and with actual fists and claws, wasn't as far and has curved cannon ports rather then rectangular ones
a lot of other depictions, especially lately, give him stubby limbs with tiny hands, geometric cannon ports, and make him super fat and wide