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>Rapist Alices are those that live to rape other yukkuri (especially Yukkuri Marisa and Yukkuri Reimu) and produce koyukkuri. There are of course, exceptions to this. Some artists may treat Alices just like other yukkuris, without any of the rapist or peni peni abilities present.
>There are some theories as to how Alices become rapists; it could be that the behaviors is hard coded into their genetic material. Other stories may blame it on them being raised that way (by their rapist parents). Maybe if they got raped them selves and started raping other yukkuri. like in the story "New Rape Troup". In some comics, wild yukkuri Alices form large packs, "rape troupes", and attack other yukkuri; raping them multiple times. The victims sprout multiple child-bearing stalks that drain nutrients from the victim's body, eventually killing them. In the majority of comics, the bodies will be left to rot, while the Alices move on. In others, the children are raped and eaten.
>Yukkuri Alices often appear as antagonists in the stories, or as another tool for Anon to bully other yukkuri with. In some comics, they're used by factories as a way to speed-breed different types of yukkuri. Some comics and stories feature a deconstruction of this with Alices falling victim to other yukkuri due to prejudice. There is Kind Mother Reimu by the artist,"pixely guy", which feature koalices being mistreated despite their general kindness.