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Eureka X49
About
Eureka X49, also known as Yurika Shiki, streamed on YouTube from 2020 until rebranding as Kishi in September 2025, when she continued as a VTuber under that identity. A singer and anime fan, she streamed primarily in Chinese; her fans are called Rekadan.
Character Info
Community
Recent Activity
Introduction Video
Gallery
Personality
Eureka speaks with a British accent.
Appearance
Eureka has silver hair with an ahoge and single light yellow streak in her bangs with green and yellow eyes, with piercings and a blue bandage on her cheek. She wears has a black and yellow zipped-up jacket with a bare midriff. She has a QR code on her leg. Her charm point is her fang.
Background
Eureka first revealed her original 3D model on 2 September 2020 and uploaded introduction video on 9 September 2020. She made her debut stream on 18 September 2020.
Her initial concept was a purely digital being, with a canonical height of 536 pixels. Her full name was "Project: Eureka Experiment #49."
Fans
- Eureka's fans are known as "Mandem", "Lab Rats", or "Rekadan".
Lore
- Eureka is the 49th in a series of artificial lifeforms created by the Professor as part of Project: Eureka. The first 48 were destroyed. * Eureka is a genetically modified human. She was originally a digital creation, but acquired a human body. * Eureka does not know where she lives, because she has never been outside. * Her tail is a power cord and plugs into her spine. It is USB-A. ** Her tail can use various attachments, including a microphone for karaoke and a box cutter for building plastic model kits. * Eureka wears fingerless gloves to improve her magic defense. * She is part of the Martian Assassination Association, or "MAss Ass". She often takes breaks to attend assassin training on Mars.
Likes and dislikes
- Eureka's favorite color is yellow blue.
- She loves the anime Mobile Suit Gundam 00.
- She loves Saji Crossroad Setsuna F. Seiei.
- She hates Saji Crossroad.
- Her favorite train is the Ginza line, because it looks like pudding.
- Eureka's favorite food is cookies. Her favorite drink is water coolant.
- Eureka likes underground idols, anime (especially by Kyoani), games (MMORPG, Pokémon, and FPS), martial arts, and sweets. She dislikes mornings.
- She likes the Pokémon Toxel, martial arts, and sugar.
- Her fears are dolls, clowns, and turning into pizza.
Miscellaneous
- She has a brother complex.
- She tends to oversleep.
- She speaks in a Martian accent that is curiously close to a British accent.
Contributors
This profile is enriched by VTuber Wiki community editors. Thank you to:
Credits sourced from VTuber Wiki page revision history. Vtubie and Hololist do not expose per-page contributor data, so this list reflects VTWiki editors only.
Frequently mentioned
More VTubers from United Kingdom
Art credits
Designers, illustrators, riggers and modelers credited on the official character.
- 3D ModelerEurekaX49
- 3D ModelerIllustration (2D): Moshie
- 3D ModelerPixel
- ModelerPoribaketsu
More Info
2020
On 22 November, Eureka announced that she had reached her first YouTube 100 subscribers.
2021
On 6 April, Eureka reached 500 YouTube subscribers.
Around 3 August 2021, she reached 1,000 YouTube subscribers.
On 11 September, Eureka held a re-debut stream to reveal her Live2D model. It was attended by 69 viewers.
2022
On 1 January, Eureka revealed a new pixel model by Poribaketsu. She also announced a Minecraft server.
On 31 May, Eureka announced a hiatus, followed by a karaoke stream on 3 June. She planned to return for her birthday on 3 July.
2023
On 15 January, Eureka reached 2,000 YouTube subscribers in an endurance karaoke stream.
Rebrand
On 18 August, she began teasing a rebrand by posting a series of mysterious previews.
On 10 September, she announced a rebrand from "Eureka" to "Kishi." Her emoji changed from ☣️ (biohazard symbol) to 🩹 (band-aid), and several accounts were renamed from "eurekax49" to "kishi_ex".
On 21 September, she held a re-debut stream, revealing a new model and identity. From this point she would continue to stream as the VTuber and utaite Kishi. The character of Eureka X49 was effectively retired.
Quotes
- "Everyone is my mandem, innit?"
- "Why do you want to be normal when you could be extraordinary?"
- "This is my nub cup"
- "KSKSKASDSLAS STOP"
- "i only say seiso things"
- "im not horny im curious"
- "GOOD MOREKAAAAA!"
Name
- Eureka's name is written various ways: ** Her surname is written X49 (for Experiment #49) or 四九 (kanji for 49), read Shiki. ** Her given name is Eureka or ゆりか, read Yurika. ** Her full name is variously written in English and Japanese order: Eureka X49, X49 Eureka, Yurika Shiki, and Shiki Yurika.
Goals
- Eureka's goals are to get a Live2D model, do a 3D model idol live, and to get good at FPS games. ** She acquired her Live2D model on 11 September 2021. She has never gotten good at FPS games. * At her Live2D re-debut, she announced new goals to speak better Japanese, get "STRONK", start a Eurekaland community Minecraft server, become a robot, and maybe become an idol. ** She established the Eurekaland Minecraft server on 1 January 2022. * Her fears are dolls, clowns, and turning into pizza.
Media
- EUREKA X49 四九ゆりかch - YouTube channel
- eurekax49 - Twitch channel
- @eurekax49 - Twitter account
- eurekax49 - Marshmallow account
- eureka - Ubereats fund
- Rekadan Laboratory - Discord server
- eurekax4x9 - carrd
Hashtags
- #eureCAST - Stream tag
- #eureCANVAS - Fan art tag
- #eroreka - Fan art tag (18+)
- #eureCACHE - Notes tag
Statistics
- eurekax49 - TwitchTracker stats
- eurekax49 - SullyGnome Twitch stats
- eurekax49 - Social Blade Twitch stats
- EUREKA X49 四九ゆりかch - Social Blade YouTube stats
- EUREKA X49 四九ゆりかch - Playboard YouTube stats