Because jynx is the original "yokai" and most westerners didn't know (and still don't know) shit about japanese supernatural stuff.
Not that it mattered since her base inspiration was borderline offensive and would have turned off children anyway (people actually think kids were going to prefer a fucking mountain woman over dragons and bazooka turtules).
So despite what these
>>24727052 >>24731144 >>24727083 knuckleheads think their Jynx was fucked no matter what. It also the reason why Yokai Watch was screwed internationally before it got localized.