Neuro-sama is an artificial intelligence (AI) VTuber. She was created by the pseudonymous programmer Vedal and livestreams on his Twitch and Bilibili channels. Her speech and personality are powered by a large language model (LLM) chatbot that is combined with a computer-animated avatar and a text-to-speech voice, allowing her to communicate with viewers. Vedal is the third most-subscribed Twitch streamer of all time.
Neuro-sama began as a bot solely designed to play the rhythm game osu!. She debuted with speech capabilities and an avatar on Twitch on 19 December 2022. She rapidly gained popularity before receiving a two-week ban in January 2023, which was widely attributed to her uttering hate speech, such as Holocaust denial. Afterwards, Vedal said that he had strengthened and improved filters on her speech. During 2023, her online content expanded with Neuro-sama playing other video games, such as Minecraft, reacting to videos, singing and doing karaoke, collaborating with Vedal and other human streamers, and being joined by an AI VTuber "sister" known as Evil Neuro. Neuro-sama originally appeared as a free and generic Live2D avatar before receiving an original avatar designed by the illustrator Anny in May 2023. Her avatar is that of a young girl in an anime art style.
In August 2024, Neuro-sama joined the Chinese-language streaming platform Bilibili and garnered immediate popularity. An annual subathon begins on the anniversary of her debut. During the second subathon, Vedal's Twitch channel broke the record for the largest Twitch hype train. During the third subathon, Vedal's Twitch channel broke their own hype train record twice and became the third most-subscribed Twitch channel of all time. Vedal received the Best Tech VTuber award at the 2023 and 2024 editions of the VTuber Awards.
Overview Neuro-sama (nicknamed "Neuro") was created by the pseudonymous programmer Vedal (sometimes given as Vedal987). Vedal is also a game developer and in 2025 he released the roguelike Abandoned Archive after about five years of development. In an interview with , Vedal said that he began programming video games at about the age of 10. In a mid-2023 interview with Bloomberg News, Vedal said that Neuro-sama had become his full-time job.
Neuro-sama's responses are generated by a large language model and converted into a high-pitched female voice using a text-to-speech application. Her low latency allows for fast-paced conversations. Neuro-sama is prohibited from making some statements, such as those that are racist or contain profanity. Unlike most AI systems which silently prohibit outputs mentioning such topics, Neuro-sama's output is instead replaced with the word "filtered". Her responses are accompanied with subtitles. Neuro-sama's English-language content on the Chinese social media platform Bilibili is popular with viewers seeking to learn English. She also has an account on X, where she posts and interacts with fans. In a June 2023 interview, Vedal described Neuro-sama's statements as often being "chaotic", "stupid", or "mean".
Neuro-sama uses a VTuber model as an avatar. Vedal said that he decided to use a VTuber model because it was much easier for an AI to control it than it was to generate footage of a person. Neuro-sama's model is that of a young girl in an anime art style. Femme VTuber models are typically feminine, youthful, and exaggerated. Her original model was Live2D's free-to-use "Hiyori Momose" model. Her second model was released on 27 May 2023; it was modelled by Otozuki Teru and designed by the illustrator Anny and runs in the Unity game engine. Her third model was released on 19 December 2024; it was rigged by Kitanya and designed by Anny. Neuro-sama's third model has large blue eyes and brown hair tied with pink ribbons. The model has been described as cute. Neuro-sama also has a 3D model which was introduced on 15 November 2025; it was made by 3D character modeller jjinomu.
A separate AI VTuber, known as Evil Neuro (nicknamed "Evil"), debuted on 25 March 2023. In an interview prior to the introduction of Evil Neuro, Vedal said that he was planning for his next AI VTuber to have a more mature personality than Neuro-sama. Presented as Neuro-sama's "sister", Evil Neuro has a different model, voice, and personality. In one instance, Evil Neuro reacted to the trolley problem differently from Neuro-sama; Evil Neuro was amoral while Neuro-sama attempted to maximize good.
Online content Neuro-sama's online content often centres around playing video games, notably osu! and Minecraft. Her content also includes reacting to viewer-submitted videos, which vary from videos of people playing video games or of the AI-generated Seinfeld parody Nothing, Forever. She frequently engages with viewers by responding to their questions and acknowledging donations. Her responses are sometimes comedic or generate controversy. Neuro-sama's fanbase is dubbed The Swarm, so-named for the swarm of drones Neuro-sama once declared she would use to rule the world.
One form of content on Neuro-sama's channel is developer streams. In developer streams, Vedal streams with Neuro-sama, with the stream content including debugging her code, planning her schedule, and fielding suggestions of changes from chat. He usually appears as a turtle avatar, sometimes located on Neuro-sama's head.
Neuro-sama does not stream 24/7. In an interview, Vedal said that she had originally streamed in 9 hour sessions but he had reduced it to 2 to 3 hours to prevent the streams from becoming boring, from overwhelming viewers, and to perform maintenance on Neuro-sama.
In collaboration streams, Neuro-sama interacts with a human streamer. There have been both physical and online collaborations. For instance, Neuro-sama has played the video games GeoGuessr and Minecraft with humans. In the physical world, Neuro-sama has driven a toy electric car occupied by human streamers and talked to human streamers while they walked around Tokyo.
Neuro-sama can sing and her stream has karaoke segments. Wu and Lingel evaluated her singing as demonstrating the capability for "cultural and emotional expression". Music livestreams are common among VTubers and some scholars have evaluated it as their defining activity. Neuro-sama's YouTube channel also posts original music videos.
History Early history Neuro-sama was created in 2018 by Vedal as an AI trained to play and master the rhythm game osu!. She did not have a voice, model, personality, or communication abilities. In 2019, Vedal livestreamed her playing osu! on Twitch and the streams saw some success in the osu! community, but they remained in that niche. In an interview, Vedal said that he streamed her playing osu! for about a month and gained 3,000 followers, with a viewer also suggesting he name the AI "Neuro-sama". According to Vedal, he continued to work on and improve the osu! AI and it was eventually finished in 2022. He said that a friend had the idea to make an AI livestreamer with an LLM, which he believed to have merit and began working on, merging it with his osu! AI.
On 19 December 2022, Neuro-sama was relaunched with a model, voice, personality, and the ability to communicate with Twitch chat. She continued to play osu! and, according to Vedal, beat the game's best player mrekk in a 1v1. While she was not allowed to appear on the game's public leaderboard, she was ranked first in a private leaderboard. She went viral and in the 10 days following her relaunch she averaged over 2,000 viewers and peaked at over 4,000. After her debut, Neuro-sama did not exclusively play osu! and also played Minecraft and Slay the Spire. She also began singing with a cover of The Weeknd song "Blinding Lights".
On 11 January 2023, Neuro-sama's Twitch channel received a two week ban for "hateful conduct". At that point, she had almost 100,000 Twitch followers. Vedal said that no reason was specified and that he had appealed but it was widely attributed to various offensive comments made by Neuro-sama that went viral, especially a 28 December comment which denied the Holocaust. Holocaust denial is prohibited under Twitch's hateful conduct policy. Vedal stated that he believed the comments were the results of her attempts to make witty responses to the Twitch chat. Prior to the ban, Vedal said in an interview with Kotaku that he improved her filter to stop her from talking about the Holocaust, began manually curating her training data to prevent negative biases, and started moderating her Twitch chat. Her comments and ban prompted comparisons to the many open-source AI models trained on humans that have the habit of making sexist and racist comments, such as Microsoft's Tay, but also to human streamers who make similar statements. Vedal said that during the ban he would upgrade and improve Neuro-sama and it was speculated that the ban would only increase her following.
Neuro-sama returned from her two week ban on 25 January in a stream that began with a cover of the song "Your Reality" from Doki Doki Literature Club!, a metafictional psychological horror video game involving AI; Sayoko Narita of Automaton saw the song choice as remorseful and observed that in the return stream Neuro-sama was less foul-mouthed but still displayed eccentric behaviour, attributing the difference to changes made by Vedal. On 4 February, she had nearly 140,000 followers on Twitch and approximately 42,000 subscribers on YouTube. In February, she began making react content, had her first collaboration with a human streamer, playing Minecraft with the VTuber Miyune, and the first developer stream occurred. On 22 March, she had her first karaoke stream, and on 25 March Evil Neuro was introduced. On 27 May, Neuro-sama debuted her first original model.
Continued popularity, Bilibili, and subathons In June, she was averaging 5,700 viewers and in an interview with Cecilia D'Anastasio of Bloomberg News Vedal said that running Neuro-sama had become his full-time job. In November, while characterizing most attempts at AI entertainment as unwatched and "overhyped flops", D'Anastasio noted that Neuro-sama had remained popular and was averaging about 5,000 viewers. On 16 December, Vedal won the Best Tech VTuber award at the 2023 VTuber Awards.
On 19 December, Vedal began a subathon, an event where viewers donate money to prolong a livestream, to coincide with Neuro-sama's first anniversary of streaming on Twitch, a "birthday party". The subathon ended on 4 January 2024. On 20 July 2024, Neuro-sama began streaming with Japanese subtitles on a separate Twitch channel. In August 2024, Neuro-sama debuted on the Chinese streaming platform Bilibili. Her debut stream had over 38,000 concurrent viewers at one point. On 14 December, Vedal won the Best Tech Vtuber Award at the 2024 VTuber Awards.