This article is also available in Japanese: Read the Japanese version
Have you heard of Cecilia Immergreen, a member of the hololive English group "-Justice-"? She is a VTuber whose official profile describes her as "an Ancient Automaton, with a penchant for flowers, tea, and creating music." She began her activities with her debut stream on June 23, 2024, and in 2026 she released a song with Gigi Murin, "CCGG MADNESS," and also appeared in the hololive English 4th Concert.
In this article, we introduce Cecilia's profile and activities based on hololive's official talent page, the debut announcement, the official music page, and the official concert report. We do not fill in by guesswork any information that is not in official materials, such as her real name, real age, where she is from, or her family.
Cecilia Immergreen's Official Profile: Birthday, Height, and Debut
Name: Cecilia Immergreen
Name in Japanese: セシリア・イマーグリーン
Birthday: November 11
Debut Stream: June 23, 2024
Height: 162 cm
Unit: hololive -Justice-
Illustrator: DSmile
Her talent page on the official hololive website lists her birthday, debut stream date, height, unit, and illustrator.
The birthday and height given there belong to the official character profile published for her as a VTuber. They should not be read as a real person's date of birth or physical data.
Her illustrator is DSmile. The person credited with the character design and the talent's own activities need to be checked separately.
The official page also links to her YouTube and X accounts, which makes it a reliable starting point for following her activities.
An "Ancient Automaton" with a Penchant for Flowers, Tea, and Creating Music
Her official profile describes Cecilia as "an Ancient Automaton, with a penchant for flowers, tea, and creating music." According to the character setting, she was crafted in ancient times and "originally made to be dedicated to eternal servitude."
Her official profile also shows another side of her: in recent times, it says, she "began slacking off on her work" and is "mostly immersing herself in her various crafty hobbies." The profile even includes a line about her sometimes "lazily cooking mostly potatoes along with whatever else she found in the kitchen." Against such a weighty title as "Ancient Automaton," it's a line that makes her feel somehow approachable.
None of this describes Cecilia's real background or private life; it is a character story published by hololive. If you keep the setting and her actual record of activities apart, you should be able to enjoy both the personality of her profile and her achievements in streaming and music.
Debuting as One of the Four Members of hololive English -Justice-
On June 19, 2024, hololive announced the debut of a new group, hololive English -Justice-, in its official debut announcement. The four members are Elizabeth Rose Bloodflame, Gigi Murin, Cecilia, and Raora Panthera. According to the announcement, Elizabeth is "Justice’s manager, but she does not necessarily hold more power than the other three."
The date and time of Cecilia's debut stream was June 23, 2024, at 12:00 p.m. JST. This matches the debut stream date on her official talent page.
The announcement also lists her official YouTube handle, "@holoen_ceciliaimmergreen." Her current official channel ID is "UCvN5h1ShZtc7nly3pezRayg." This is not a value inferred from the handle; it can be confirmed from the YouTube link on her official talent page.
"CCGG MADNESS" with Gigi Murin
In the official concert report, Cecilia and Gigi Murin are introduced under the unit name "Autofister."
The official hololive music page lists both of their names along with "CCGG MADNESS." The song was released on May 29, 2026, under the product number "CVRD-755." The official page also provides download and streaming links.
The song's title, credit, and release date can be confirmed from the official record, but the page offers no explanation of what the song means or what the two of them intended. For that reason, we do not infer anything about their private lives or their relationship from the lyrics or the title. What we can say for certain is that it is a song officially released under the names of both Cecilia and Gigi.
Three Line-ups at the 4th Concert
In July 2026, hololive English 4th Concert -Serendipity- was held in Los Angeles. The official event page records Cecilia's appearances in more than one song.
First, she performed "CCGG Madness" with Gigi as Autofister. She also joined Shiori Novella and Vestia Zeta for "Break It Down." She appeared in "Cloudy Sheep" as well, with Mori Calliope and Tsunomaki Watame. The official record shows her in different line-ups at the same concert: one duo unit, and two trios that included a guest from another group.
What matters is that the song titles and performers can be checked on the official page published after the show, rather than relying on memory or unofficial roundups. Because the concert has already taken place, we can present these in the past tense, as performances she gave rather than as plans.
Following Her Current Activities on Her Official YouTube Channel
Cecilia's official YouTube channel is linked from her hololive talent page. The channel's handle is "@holoen_ceciliaimmergreen."
Her official talent page also features Justice's 2nd anniversary live, footage from the 4th Concert, official songs, and more in its VIDEOS section. The MUSIC section on the same page lists "CCGG MADNESS" alongside Justice's song "SUPERNOVA SUPER GIRL," among others. This lets us confirm from primary sources that her official activities have continued into 2026, not just what was published at her debut.
Subscriber and view counts change every day, so this article does not list fixed figures. For her latest streams and numbers, it's best to check her own official channel.
Cecilia: A VTuber You Can Follow Through Her Official Setting and Music
Cecilia Immergreen is a VTuber active in hololive English -Justice-. According to her official profile, her birthday is November 11, her debut stream was on June 23, 2024, and her height is 162 cm. Her character setting is an "Ancient Automaton" with a penchant for flowers, tea, and creating music. In 2026 she released "CCGG MADNESS" with Gigi Murin, and at the 4th Concert she took the stage in more than one line-up.
Taken together, her profile, the group's debut, the official songs, and the concert record may let you trace in concrete terms not only her setting but also the breadth of her music activities. If you're going to follow her from here on, her official talent page and official YouTube are probably the surest place to start. Even without guessing at information that is not in official materials, such as her real name, real age, where she is from, or her family, you can learn plenty about Cecilia's activities from what is officially published.
