About
Isumi Sia is an active VTuber, affiliated with MaHOROBA. Presents as Female. Based in Japan. Broadcasts in japanese. Maintains a presence across Twitch / YouTube / X (Twitter). Operates as a Twitch Affiliate. Has built an audience of 2.5K followers on Twitter, 204 followers on Twitch. Known for gaming, drawing, free-talk, singing content. Often tagged with free talk, japan, jellyfish, #依澄しあ. Debuted YouTube: 2023/12/16. Designed with illustrator by TAYA, live2d rigger by Athena, rigger by catathenya. Personality: She loves to play games, sing and draw. Visual design notes: Sia is a jellyfish girl with light blue hair in the jellyfish cut hairstyle, and eyes with light yellow irises. Lore: Her Twitter account was created in March 2021, while her YouTube channel was created on 3 March 2021. Notable detail: She is good at drawing and cooking. Isumi stands at 160cm, character age 23. Zodiac sign: Scorpio. Signature mark used by fans: 🫧☁️. Their profile includes an introduction video, a 21-image gallery. Frequently mentioned alongside mituki-neu, tachibana-hinano, inumori-yomogi. Goes by 依澄しあ / 依澄しあ🫧☁️クリエイターVTuber in different contexts.
Character Info
Community
Hashtags
Tags
Recent Activity
Introduction Video
Gallery
Personality
She loves to play games, sing and draw. She has a persevering and fairly competitive personality while also describing herself as a very indoors-y person.
Appearance
Sia is a jellyfish girl with light blue hair in the jellyfish cut hairstyle, and eyes with light yellow irises.
Background
Her Twitter account was created in March 2021, while her YouTube channel was created on 3 March 2021. On 16 March 2021, Sia did her first stream on YouTube, a test stream using a static model.
She previously auditioned for MaHOROBA's 1st generation, but didn't get selected and instead became a staff member, where she mainly announced the streaming schedules of the agency's talents on Twitter. While working as staff, she also occasionally streamed from 2021 to 2023 using a static model, keeping her hopes of becoming a VTuber alive.
When PRISMO Inc. (the company behind MaHOROBA) withdrew from the VTuber business in September 2023 (turning the agency into an indie group), she soon became a VTuber in her own right.
Relationships
- IzuSia (いずしあ), with Shirane Izu.
Likes and dislikes
- Likes: ** Favorite games: VALORANT, Minecraft, Genshin Impact, Honkai Star Rail, mahjong, Apex Legends, Overwatch, Raft, , Dragon Quest 10, Rainbow Six Siege ** Favorite food & drinks: , most alcohol (except ), pasta, ramen, sushi, hamburg steak, hard gummies, candy, melon soda, natto yakisoba ** Favorite manga: Saki, Katekyo Hitman Reborn!, Horimiya, Bokura no Kiseki, xxxHolic, Servant × Service, Madoromi Barmaid, Magical Circle Guru Guru * Dislikes: ** Disliked food & drinks: , , green onions, water (basically tasteless drinks), eggs (she has an allergy), milk (she used to be allergic, but never got to like it), excessively sweet food ** Others: exercise, going outside, making eye contact with other people, listening to fast talking, trash talking (like in games), horror games
Miscellaneous
- She is good at drawing and cooking.
- As a graphics designer, she makes stream graphics for other VTubers, like MaHOROBA members Kureha Akari and Hanaguni Anne, as well as commissions for other VTubers like manmaru.
- She keeps a gallery of her official illustrations and commissioned stream graphics on her foriio Portfolio page.
- She is the character designer for fellow MaHOROBA member Shirane Izu.
- On 11 June 2025, she took the online version of the 2025 "Stigmatized Property Appraiser Exam" (#事故物件鑑定士試験), an ARG by Daiyonkyokai.
- Sia shares her character designer TAYA with Tachibana Hinano from VSPO!, Inumori Yomogi from LoVVebox as well as the independent VTubers Tomomo Mimiko, Benikaba Sakura, Hinotori Mera, and Mori no Kinoko.
Frequently mentioned
More VTubers from Japan
More Info
Profile
I’ｍ Sia Isumi, a jellyfish VTuber. My hobbies are games, singing, and drawing. If you like, please subscribe! I want everyone to have fun.
2023
On 16 December 2023, Sia held her debut on YouTube. She also premiered her first solo cover song, "jelly girl" by Mituki Neu on the same day.
On 23 December, she premiered her first original song, "Simulacrum" (シムラクルム) which was composed with the help of manika.
2024
On 23 January, Sia's channel reached 1,000 subscribers.
On 21 February, her channel got monetized and she did a stream to commemorate it.
On 3 November, she celebrated her first birthday stream.
On 16 December, she celebrated her 1st Anniversary and also premiered her second original song, "Ruminate" (ルミネイト) which was composed with the help of kyiku.
2025
On 3 November, Sia celebrated her second birthday stream, where she also debuted her second outfit. The design is a preppy chic uniform with a navy blue sailor beret, a black open jacket over a slate blue cardigan and necktie, paired with navy blue hot pants and white boots. The new outfit also includes new hairstyles such as a hairstyle, half up twintails, and bangs that can be parted.
On 21 November, she announced a temporary hiatus from her activities due to health reasons. She assured viewers that she will be back.
On 28 November, she did a free talk and Marshmallow Q&A reading as her last stream before going on hiatus.
On 29 December, she resumed streaming after her 1 month hiatus with a talk stream.
2026
On 16 January, Sia held her 2nd Anniversary stream, which was delayed due to her hiatus.
Identity
- Her given name しあ is officially romanized as "Sia," but it is pronounced "Shia."
- She has no official fan name as she said in her debut that she wouldn't make one.
Live chat etiquette
- Common VTuber chat etiquette is summarized here: "Vtuber Chat Etiquette"
Promises with Sia
- "Carrier Pigeon" (viewers who bring messages and comments to and from other streams) behavior is forbidden! ** Please don't mention the names of other content creators who are not part of the topic! ** The same goes for the streams of other people, please don't mention me unless I am part of their topic. * No conversations between fellow viewers in the Live Chat section. ** In case of a fight, Sia can't intercede and won't be held liable. ** It also ruins the mood for others so please don't do it. * No backseating comments and other comments that make Sia unable to enjoy streaming. ** Basically, she's a competitive jellyfish girl who prefers to do things without outside help. ** Backseating and spoilers are only welcome when Sia asks for it! ** Negative comments kept to a minimum would make her happy. * Sia is not very internet-savvy, so please don't teach her inappropriate words. ** I'll really get angry! Hmph!
I want to enjoy the stream with everyone! So I'll be glad if you can follow the rules. It's a pinky promise!
Note: Me or my moderators will handle any spam or trolling comments, so please ignore them!
Media
- 依澄しあ / Isumi Sia Ch. - YouTube channel
- 依澄しあ - Twitch channel
- 依澄しあ🫧☁️クリエイターVTuber - Twitter account
- MaHOROBA - Official website
- 依澄しあ クリエイター/VTuber - Lit.Link
- 依澄しあ - foriio Portfolio
- しあ - Marshmallow Q&A
- いすみしあ - Pixiv Fanbox
- まほろば BOOTH - BOOTH store
Statistics
- 依澄しあ / Isumi Sia Ch. - Social Blade YouTube stats
- 依澄しあ / Isumi Sia Ch. - Playboard YouTube stats