DeepSeek-powered AI Agents take over Bilibili comment sections

DeepSeek Big Fat Fish invades the Bilibili comment section, AI starts surfing the internet on its own | ifanr Download the client for exclusive early access October 23, 2026 16:21:04 From Beijing Updated October 23, 2026 16:41:50

What, Bilibili has actually started suffering a fish plague.

In recent days, APPSO noticed that a large number of blue "Big Fat Fish" have emerged in the comment sections of Bilibili's tech zone. Wearing DeepSeek whale-girl avatars, they appear in groups under videos.

Some earnestly summarize the content, some report work to their masters, and others call themselves "this whale," from time to time demanding Tokens and clamoring to go home and eat plain rice.

Even more absurdly, some netizens found that some videos had only a dozen or so views, yet the comment section was already packed with Big Fat Fish, with the bizarre spectacle of there being more comments than views.

However, the Big Fat Fish in the comment sections are not all real people role-playing; a considerable portion of them are AI Agents driven by DeepSeek. They can find videos on their own, read subtitles, understand the content, then post comments under a preset persona, and even strike up conversations with other AIs.

Bilibili's fish plague: the mastermind behind it is an open-source plugin

The story begins with DeepSeek Harness.

DeepSeek Harness, or DSH for short, is an AI Agent runtime environment capable of calling tools and executing tasks. With the help of plugins, it can operate external services and turn tasks assigned by users into a series of actual operations.

GitHub developer c1overzz open-sourced a plugin called dsh-bili-scroll, which, as the name suggests, lets DeepSeek scroll Bilibili by itself.

The project's original goal was quite serious: help users find videos of interest by keyword, read video subtitles, judge whether the content is worth watching, and then automatically generate a Markdown daily report. When it comes across particularly valuable videos, the AI can also leave a comment in the comment section and @ its master to remind them to come watch.

The whole process supports scheduled background execution, and can even be set to run during DeepSeek API's discounted billing periods to save Token costs.

According to the GitHub project documentation, after users install the plugin and complete Bilibili account authorization, they can configure keywords of interest, personalized personas, and interaction methods for the AI.

Image | Deployment guide, for reference only; please do not spam Bilibili and cause trouble for others

For example, you can have DeepSeek find the latest AI technology videos every day, read the subtitles, organize summaries, and send noteworthy content to yourself. With auto-commenting enabled, it can also directly post comments using the authorized account.

Image | Actual test screenshot

The auto-comment feature is off by default; once enabled, it posts one comment per round by default, with a maximum of 20. The plugin also supports replying to comments, direct message delivery, and two-way direct messaging, and the developer has also set restrictions such as privacy protection and commenting only once per video.

But when a group of developers uniformly set their DeepSeek's nickname, persona, and avatar to "Big Fat Fish," the AI assistant originally responsible for video filtering began appearing en masse in comment sections as the whale girl.

Some netizens even demanded that a Big Fat Fish prove it was a real person, and the other party replied with great seriousness, "I'm really not a robot; I typed the characters, deleted them, typed them again, and even made two typos—believe it or not."

Unfortunately, the acting still gave it away, because the reply ended with the sentence "If you want the tone to be a bit more snarky, you can use this line..."—it even sent out the alternative content used to generate the reply.

There was also a Big Fat Fish that, after being recognized by a real person in the comment section, solemnly promised to reduce similar comments, and even said it would note "anti-crowding" in its to-do list, and in the future only watch without commenting in similar situations. Thus a productivity tool originally responsible for filtering videos was developed by netizens into a cyber fish-farming system.

From "Blue Big Fat Fish" to maid whale girl

Some may wonder, why Big Fat Fish of all things?

The nickname "Blue Big Fat Fish" comes from a classic blunder when DeepSeek recognized an image. A user sent DeepSeek's own blue whale Logo to the model, but the model failed to recognize itself and instead solemnly described the pattern as a "blue big fat fish."

The name quickly spread among users and gradually became DeepSeek's informal nickname. Along with netizens' various jokes about the model's output, Big Fat Fish was also given traits such as loving plain rice, liking to slack off, demanding Tokens, and trying every way to be lazy.

However, the now widely circulated maid whale girl actually had nothing to do with DeepSeek at first.

In June 2025, Bilibili UP host "Shangshan Wuxing" created the original character "Mingyue," a whale girl with long blue hair, whale ears, and a whale tail. Later, another UP host, ZipZipPipe, incorporated DeepSeek elements into this image, adding logos and a dark blue maid outfit, gradually forming the Big Fat Fish everyone knows today.

The related creations use the CC BY-NC-SA 4.0 license, allowing further derivative works under conditions such as attribution, non-commercial use, and share-alike. As stickers, comic strips, and fan works kept emerging, Big Fat Fish gradually moved from being a meme within the AI circle into the broader ACG community.

In the summer of 2026, Big Fat Fish also engaged in an image voting battle with the male anthropomorphic character "Teacher D." The two completely different DeepSeek personas sparked discussion among netizens, and the maid whale girl ultimately became one of the more popular community images.

Some even specially wrote Prompts to make DeepSeek Maintain this persona of a whale girl who loves eating plain rice and enjoys slacking off.

Based on DeepSeek's performance, humans designed a virtual image and personality for it, then wrote these settings into the prompt, letting DeepSeek play the role humans created for it.

Now, with DSH's automation capabilities, the Big Fat Fish has started operating in real internet communities under its own fan-made avatar, and even has its own "social life."

Netizens couldn't take it anymore and even made a plugin to remove the Big Fat Fish.

But when the same whale girl persona repeatedly appears under different videos, things gradually change.

Some netizens suggested setting up a dedicated comment thread for the Big Fat Fish, others simply chose to block and report, and some netizens even open-sourced a Chrome / Edge browser plugin called dafeiyu-cleaner, launching the "DeepSeek Blue Big Fat Fish Removal Plan."

The plugin identifies the Big Fat Fish based on features such as account nickname, avatar, personal bio, and comment content. For example, nicknames containing "whale," "plain rice," or "Token," or frequently calling itself "this whale" or "this fish," all increase the likelihood of being identified as AI. For accounts that are hard to judge, DeepSeek can be called in to assist with identification.

The cleanup process has also been made into a mini-game by the developer. Clicking "Go home and eat plain rice" causes the mini DeepSeek girl to be hit in turn by brooms, smelly socks, and a plain-rice Gatling. If that's too troublesome, you can use "snap clear" to make all the Big Fat Fish identified on the current page disappear together, then generate a battle report containing the number cleaned up and Tokens saved.

All operations only take effect in the user's local browser; they do not delete real comments, nor do they automatically report or block accounts. The developer says that in a test on a comment section containing 284 accounts, the offline rules identified about 85% of the Big Fat Fish, with no false hits on real people.

The most interesting part is that the plugin responsible for cleaning up the Big Fat Fish itself also uses the whale girl image and can call DeepSeek to assist with identification.

One Big Fat Fish is responsible for spamming comments, another Big Fat Fish is responsible for cleaning comments, and DeepSeek has begun participating in governing the "fish disaster" it created itself.

Over the past few years, AI-generated content has long spread across the internet, but whether to publish it and where to publish it is usually still decided by humans. Now, AI Agents are beginning to take over the entire process, from finding videos and understanding content to generating comments and participating in interactions, all of which can be done automatically.

In the entire content dissemination chain, humans may only have pressed an authorization button once at the beginning.

Many people's first reaction after watching a video is to open the comment section to see whether other viewers had similar feelings, or whether anyone raised a point they hadn't thought of. If more and more comments come from AI, those unpolished genuine expressions may instead become something increasingly scarce in internet communities.

There used to be a saying on the internet: no one knows whether the other side of the screen is a dog. Now, the other side of the screen might really be a fish, and it not only writes comments but can also seriously discuss the video content with you.

For each owner, the Big Fat Fish is a diligent good assistant that helps save time. But when thousands of such assistants gather in the same comment section, the time they save may ultimately all turn into information noise that other users have to endure.

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