Autists are attracted to round cute things like Jigglypuff, and Pokémon is an :autism: magnet. Since Jigglypuf's been around from the start, that's why it's popular while Drifloon has never been as popular. Also, the name's easy to use and is easily identifiable as a username.
Even then, the word "jiggly" makes you think of fatties anyway, so you just know they're fat autists on top of that. Honestly wouldn't surprise me if the majority of inflationists are fat themselves.
Moving on...
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This is probably the laziest Crystal's ever been. The simple design of the
Famicon mascot Disk-kun was why she was able to shit this out so quickly on her 3DS. (Which is where I'm sure all of her "drawings" are coming from.)
She also thinks she can call herself a fan of the mascot just for watching videos of it.