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The currently hot AI being used to generate holos is the NovelAI. Previous thread posters doubt that there's a company behind this but it's true, it is a paid subscription service, 25 bucks for a month. It is trained on danbooru which is how it spits out decent looking images, but upon looking into it further you'll quickly notice that is also its drawback. Most of the poses will be samey, and holos with not enough dataset will be hard to generate images for. It seems to generate pretty convincing suisex too.