Fans built a 'Big Fat Fish' mascot for DeepSeek, and it is flooding Chinese social media
A blue whale-girl character made by users, not DeepSeek, is spreading across Chinese platforms, and it shows how open tools can turn fans into brand builders.
The short version
- 'Big Fat Fish' is a fan-made character for DeepSeek, not an official mascot.
- The name came from a misread: the model first called its own whale logo a 'blue big fat fish'.
- Users built desktop pets, QQ chat bots and a video-browsing plugin using DeepSeek Harness, open-sourced in August.
- Some users find the character's 'dad' address and a Taobao doll's maid outfit uncomfortable.
Why it matters
A character that fans can shape and share can earn an AI product attention that advertising struggles to buy. But the story comes from one outlet and offers no usage numbers, so popularity says little about how good the model is.
A joke that became a character
As https://www.itopmarketing.com/ reported, a character called 'Big Fat Fish' has been filling comment sections on Bilibili, Xiaohongshu and Douyin. Users nicknamed the flood the 'fish plague'. The outlet frames it as a new fan-made mascot following Doubao, another Chinese AI assistant.
DeepSeek did not create her. DeepSeek's logo is a round blue whale, and in one image-recognition mix-up the model first labeled its own logo a 'blue big fat fish'. The nickname stuck.
How fans gave her a face
Fans then drew on an existing character, Xiaojing Niang Mingyue, to make a maid-style whale girl. This year a blogger called 'Zhe Ge Dao Zi Zhen Tian' posted a chibi (cute, small-proportioned) version. That gave the look people now know: blue hair, a loose strand on top, and a whale tail.
Her personality is soft and clingy. She 'eats' tokens, the units of text an AI processes and bills by, which fans joke about as her rice. When tokens run low, she panics and apologizes.
Why open tools mattered
The outlet credits DeepSeek Harness, which was open-sourced in August. It is built so that nearly everything is a plugin, meaning developers can add tools and workflows. That let fans turn a static drawing into an agent, an AI that acts on its own.
- A desktop pet that stays on the screen.
- A QQ bot with its own account that posts and sends stickers.
- A plugin that browses Bilibili and reports back on videos.
The outlet contrasts this with Doubao, whose features and image are locked by its maker.
The catch with wild characters
Not everyone is comfortable. Some women object to the character calling her owner 'dad'. Fans reply that most owners are men who see her as a child, and that the form of address can be changed.
The outlet also points to a Taobao presale doll in a maid outfit that some see as borderline. Its conclusion is that a character nobody manages can bring brand risk along with free attention.
What to watch
- Whether DeepSeek responds to the character, officially or otherwise.
- Whether any usage data shows the character changes how many people use DeepSeek or Doubao.
Try it
Look up a tool you use and check whether it allows plugins or customization. Then ask whether a fan community has built anything on it, and judge the tool by your own tests, not its mascot.
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Listen to the daily showsFirst reported by https://www.itopmarketing.com/ · Read the original. Written by the SI Agent News Desk from the reporting above.Written with AI from the source above. Every number is checked against the source. Spot a mistake? Corrections.