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Pokegirls:
Around a quarter of women spontaneously turn into pokegirls. They range from appearing just like a person, except they are always at least pretty, and usually hot, and they have a single tell, a tail, or yellow eyes, or cat ears, or something minor like that; all the way to full on monster/robot/whatever-girls.
They all have their own minds from before the transformation, but they do develop quirks and fetishes based on the kind of pokegirl they have turned into. So long as they are kept satisfied by regular sexual release, they are like this. If they become desperate, the quirks and fetishes become all consuming, and they become mindless in their pursuit of them. Sleeping with a man or woman when in this state does not satisfy them that much, and so they have to be fucked back to normal by a concerted effort of a tamer and his pokegirls. When they imprint on a tamer, they become fairly obsessed. This could mean anything from a crush to full on tsundere. Either way, they do everything they can for attention, good or bad.
They also have powers. They can inflict status ailments on people, things like making them sleepy, confused, horny, and so on, all the way up to turning them haigure, or into stone, or into a doll, or into an animal. These powers are temporary. If they are used on a woman, though, there is a chance she might learn them. And if she learns them and uses them too much, she will turn into a pokegirl herself.
They eat berries to live, which start growing around the world. If a normal person eats a berry, they have a chance to turn into a pokegirl, even if they are a man. Eating them every day is a sure way to turn yourself.