A study of ChatGPT usage patterns has exposed an extraordinarily prolific user with a fixation on a very specific type of fan fiction. Researchers analyzing over half a million anonymous conversations found that one person repeatedly requested stories featuring pregnant characters from the visual novel Doki Doki Literature Club, with particular focus on the character Natsuki going into labor.
The discovery emerged from "AI Fiction in the Wild," a paper by researchers at the University of Washington and University of Colorado Boulder examining the WildChat dataset. The researchers noted on page 10 of their findings that this user represented "the most prolific user in the WildChat fiction dataset and the clearest example of an infinite story demander." The person would feed ChatGPT lengthy dialogue scenarios featuring pregnant Natsuki, typically cutting off mid-sentence to prompt the AI to continue the narrative.
While Natsuki's pregnancy has no basis in the 2017 visual novel itself, the character has become a fixture in fan art and fan fiction communities. This particular user appears to have taken the obsession to an extreme level, generating story after story with minimal variation.
The WildChat dataset comprises 573,453 conversations collected with user consent for research purposes. The broader study reveals that fiction generation dominates the platform, accounting for over one-third of all conversations. Fan fiction alone makes up 49% of that fiction output, with erotica comprising another 29%. Roughly 10% of fiction conversations contained explicit content, while 17% were flagged as toxic by content moderation systems.
The research uncovered a stark concentration of activity among heavy users. The top 2% of fiction-generating users were responsible for 80% of all fiction prompts, meaning approximately 200 people generated roughly 150,000 conversations. The most prolific users showed a pattern of repetitive prompting, with the top 10 users requesting similar content 85% of the time compared to 42% among average fiction users.
Researchers identified two categories of extreme users. "Infinite story demanders" repeatedly request highly specific variations of the same narrative, sometimes continuing for months. "Story cyclers" generate multiple versions of a single story before shifting focus entirely. The Doki Doki Literature Club fanatic exemplified the former category.
Game and manga properties dominated the AI-generated fanfic landscape, with popular franchises like Naruto, League of Legends, and Freedom Planet all appearing frequently alongside Doki Doki Literature Club.
Author Emily Chen: "This study reads less like a celebration of AI versatility and more like a window into the darker corners of what the technology enables when given no guardrails."
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