Koseki Bijou: hololive English -Advent- Member Profile

Koseki Bijou: hololive English -Advent- Member Profile

By WVR Editorial Team
November 2, 2026 5 Min Read
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Status as of 2026-10-30. Koseki Bijou is an active member of hololive English -Advent-, part of hololive production.

Koseki Bijou (古石ビジュー) is one of the five members of hololive English -Advent-, the third English-language generation of hololive production. She started streaming on 30 July 2023 and has since become one of the group’s most visible faces at overseas events, from a US concert tour stop to a Taiwan collaboration and a New York convention. This profile collects what hololive’s own pages say about her, and puts her recent activity into context for readers outside Japan.

At a glance

  • Agency and unit: hololive production, hololive English -Advent-
  • Debut stream: 30 July 2023, 12:45 JST (20:45 PDT on 29 July), according to the official Advent page
  • Birthday: 14 April (as published on her official profile)
  • Height: 140 cm
  • Illustrator: Kitada mo
  • Main language: English
  • Official channel: YouTube, @KosekiBijou

Character

Her official profile gives her the title “The Jewel of Emotions”. In the setting, she was formed when human emotions crystallised over a very long time, with beauty and negativity both piling up inside her and giving her a distinctive glow. The profile says her radiance grows stronger when she meets people, particularly when their feelings are positive. Because she was so valuable, greedy groups fought over her, and she was eventually locked away from other people. Her tagline on the profile is a wish that viewers will feel her radiance.

That backstory ties directly into the Advent concept. The group is framed as prisoners who escaped from “The Cell”, a huge underground prison whose location is unknown, with a shared aim of rebelling against the world, their fates and their monotonous lives. Bijou’s gem-like design and emotion-themed lore make her one of the clearest examples of how hololive English builds each member around a single strong image.

Debut and the Advent generation

COVER Corporation announced hololive English -Advent- on 26 July 2023. The five debuting members were Shiori Novella, Koseki Bijou, Nerissa Ravencroft, Fuwawa Abyssgard and Mococo Abyssgard, the last two debuting as the twin act FUWAMOCO. Bijou’s debut stream ran from 12:45 to 13:30 JST on Sunday 30 July, right after Shiori Novella’s, and the group’s joint debut collaboration stream followed on Monday 31 July at 13:30 JST. Because JST is well ahead of the Americas, these slots fell on the evening of 29 and 30 July in Pacific time, which is how the official page lists them.

Music

Her official page lists around twenty releases, most of them hololive English singles and group songs. Titles named on the page include “Spotlight”, “Serendipity”, “Freaky Deaky Love” and “Unchained”. The embedded video above is the music video for “Spotlight”, an original song credited to hololive English -Advent-. The same page also collects 3D clips, voice packs, animations and concert footage, including the Advent 3rd anniversary 3D live titled “Bound by Fate”. If you are new to her, the music video and the anniversary live are the quickest ways to hear her alongside the rest of the generation.

Live events and overseas appearances

Several official announcements show how much of her activity is aimed at fans outside Japan.

  • hololive English 2nd Concert -Breaking Dimensions- (24-25 August 2024): held at Kings Theatre in Brooklyn, New York, with all three English generations on the bill. Bijou performed on both days, according to the event page. Stream tickets were sold in yen through Streaming+ and SPWN until 25 September 2024, after which the archive was no longer available, a good example of why overseas fans should check archive deadlines. Our guide to buying and watching Japanese VTuber concert streams explains those platforms.
  • hololive Meet 2025 Ambassadors (announced 2 April 2025): Bijou was named one of the ambassadors representing hololive English, alongside members from hololive, hololive Indonesia, hololive DEV_IS and HOLOSTARS. COVER said ambassador merchandise would follow later.
  • Makeship plushies (announced 26 May 2025): a limited-time crowdfunded plush collection featuring all five Advent members. Makeship only produces projects that reach their funding target, so a plush is not guaranteed until a campaign succeeds.
  • “Dive into hololive” in Taiwan (2026): she appears with Yukihana Lamy, Ninomae Ina’nis and Juufutei Raden as one of four “undersea princesses” in the key visual. The museum event ran from 27 February to 27 March 2026 and the Taipei cafe from 14 March to 26 April 2026 (Taiwan time), with new outfits shown at the cafe.
  • hololive English 4th Concert -Serendipity- (3-4 July 2026): announced for the Shrine Auditorium in Los Angeles with 15 performers, Bijou among them. The event started at noon JST on 4 and 5 July; streaming passes went on sale on 6 April 2026 at 13:00 JST through SPWN and Streaming+.
  • Anime NYC (20-23 August 2026): hololive production’s booth at the Javits Center was announced to include “SUPER KARAOKE PARTY SUMMER WAVE @ NYC”, a 3D karaoke show with Kobo Kanaeru, Mori Calliope, Koseki Bijou and Nerissa Ravencroft, with ticketing handled by the convention.

Since the Serendipity concert and Anime NYC have already taken place, check the hololive English channel and her own channel for archives or recaps rather than expecting a new ticket sale.

Collaborations and related talents

Bijou’s closest ties are inside Advent: Kobo Kanaeru of hololive Indonesia and Mori Calliope appear beside her in the New York karaoke lineup, while Ninomae Ina’nis shares the Taiwan key visual. Her -Breaking Dimensions- show also included Hakos Baelz and Takanashi Kiara on the same bill.

Where to start

  • Watch the “Spotlight” music video above for the group sound.
  • Try the Advent 3rd anniversary 3D live, “Bound by Fate”, on the hololive English channel.
  • Browse the video list on her official profile for voice packs and short animations, which are easy to enjoy without Japanese or deep lore knowledge.

Official links

FAQ

When did Koseki Bijou debut? Her debut stream was on 30 July 2023 (12:45 JST), as listed on the official profile and debut announcement.

When is her birthday? 14 April, as published on her hololive profile.

Does she have an official fan name? The official profile page does not list one, so we do not give one here.

How can I watch her concerts from abroad? Recent hololive English concerts have sold streaming passes through SPWN and Streaming+, priced in yen, with archive periods that end on a stated date. See the guide linked above.

Related

Sources

Profile

Original name
古石ビジュー
Agency
hololive production
Branch / generation
hololive English -Advent-
Debut
2023-07
Birthday
April 14
Type
Genre
, ,
Streaming language
Platform
Status
(confirmed October 30, 2026)
Official links
Website · YouTube · X

Sources

Reviewed by WVR Inoue on October 31, 2026. See our editorial standards.

Thumbnail: 【MV】Spotlight【hololive English -Advent- Original Song】 by hololive English on YouTube. Shown via YouTube; all rights belong to their owners.

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