Mori Calliope

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On 12 September, she reached 100,000 subscribers on her YouTube channel.

On 15 September, she reached 200,000 subscribers on her YouTube channel.

On 23 September, she reached 300,000 subscribers on her YouTube channel.

On 7 October, she reached 400,000 subscribers on her YouTube channel.

On 22 October, Calli reached 500,000 YouTube subscribers, making her the 16th hololive member to reach this milestone, as well as the 2nd member of the English branch to do so.

On 1 November, she released a new original song "Cursed Night."

On 9 November, she reached 600,000 subscribers on her YouTube channel.

On 25 November, she reached 700,000 subscribers on her YouTube channel.

On 14 December, she reached 800,000 subscribers on her YouTube channel, Calli celebrated with an unarchived karaoke stream.

On 29 December, she sang in Tsunomaki Watame's second original song "Douten Hitsuji" for her rap parts.

On 7 January, she reached 900,000 YouTube subscribers.

On 25 January, Calli reached 1,000,000 YouTube subscribers during a subscriber endurance stream, making her the 7th hololive member to reach that milestone and the 2nd to do so on the English branch after Gawr Gura.

On 31 January, Calli debuted her eighth original song "Off With Their Heads."

On 15 February, she announced during a stream that as part of her birthday celebration she would release a second EP containing 5 songs, 4 of them original. Calli also announced that this EP would be released including physical copies.

On 4 March, Calli debuted her ninth original song "Ibasho (Where I Belong)" as part of a collaboration with the game Princess Connect! Re:Dive, during a stream on her YouTube channel.

On 25 March, she announced that she collaborated with Rikka from Holostars for an original song called "spiral tones," later in the fifteenth edition of RiTunes Labo featuring Calli, they announced that an MV was in the making.

On 1 April, all holoMyth members revealed new chibi models based on popular fan designs by Walfie.

On 4 April, she released the music video for her tenth original song, "Red," along with releasing her second EP "Your Mori."

On 30 April, hololive's Twitter account announced that every member of holoMyth would get their second 2D costumes.

On 3 May, Calli debuted her second 2D costume during a stream, an outfit inspired by hip hop culture. Unlike her main outfit, her hair is styled with a ponytail. She wears a white strapless blouse with a pink skull, a black tank top underneath, black pants with two red stripes, and gray glitter around her waist. On top of these, Calli can also wear a jacket with a design matching her scythe, alongside a black cap with golden decorations. She can wear shades and can move her hand up to hold a microphone. Unlike her standard appearance, Calli's nails are painted red instead of black. At the peak of the reveal, she reached an audience of 135,000 people.

On 10 May, the MV for "spiral tones" was released. Calli and Rikka announced an open spiral tones fanworks event for people to send remixes, vocal covers, or dances to the hashtag #morikka_st with 30 winners to receive an autographed postcard from both of them.

On 26 May, Calli announced on her Twitter account that she would go on a hiatus due to unexpected circumstances. She returned to her activities on 3 June.

On 22 June, Calli reached 1,500,000 YouTube subscribers, making her the 4th hololive member to reach this milestone, as well as the 2nd member of the English branch to do so.

On 1 September, Cover Corp. announced that the spelling of Calli's name in Japanese was officially changed from 「森美声」 to 「森カリオペ」, using katakana to spell "Calliope" rather than kanji. Calli had already used this spelling for some time, including in her logo, Twitter biography among others, and is more commonly used across Japanese community.

On 12 September, during Myth's 1 year anniversary celebration, the group revealed their official logo and announced that every member would get their third 2D costumes.

On 31 October, -Myth- debuted their first original song "Myth or Treat" during a Halloween collab with every hololive EN member attending. The song lyrics were written by Calli. The official video of the song was later debuted that same day on Amelia's channel.

On 9 December, Calli debuted her third 2D costume during a stream. Calli got a new hairstyle with her hair tied up to her left side, decorated with a see-through black lace and two red roses. She wears four red petal earrings with the one on her right having an additional hanging jewel. Calli also uses red make up on her eyelids. Her fingernails are painted dark purple. She wears a black see-through neck piece, decorated with a red jewel at the center and smaller black jewels near the bottom. Her outfit is a large red dress and her black bra is visible. On the waist area, the dress is decorated with a big red ribbon and a black lace. At the center, they are complemented with a black skull that Calli referred to as "Mister Bones". She uses heels with different tones of red. On her right hand, Calli wears a wristband and can hold a cup of wine. The dress is complemented with a removable. With this outfit, Calli also got a new blushing expression.

During this stream, Calli revealed and performed the songs featured in her new EP "Your Mori. (Lo-fi Edition)" in collaboration with dj-Jo. She also revealed that she made the illustration of the album.

On 10 December, Calli reached 1 million Twitter followers.

On 6 January, hololive's Twitter account announced that both Myth and Council members would get new year costumes.

On 9 January, Calliope debuted her fourth 2D costume, a kimono to celebrate the new year. In this costume, Calli got a new hairstyle using short hair. She has a golden diadem with sakura flowers decorating the right side. Her kimono is black with a pattern of golden flowers and a moon. The edge of her kimono seems to disintegrate into smoke. Her has red to blue tones and also has a flower pattern. In her right hand, she holds an red ochoko cup. In her left hand, Calli holds a kitsune mask that she can move up and down which is also identical to the one she holds on the cover art of "Off With Their Heads." Calli wears sandals and her toe nails are painted pink.

The same day, holoMyth debuted their second original song, "Journey Like a Thousand Years."

On 18 March, Calliope announced her first full album "UnAlive."

On 20 March, Calliope debuted her 3D model during "hololive 3rd fes. Link Your Wish" day 2.

On 26 March, Calliope reached 2,000,000 YouTube subscribers a few hours before starting a karaoke stream to commemorate the milestone. Calli is the 2nd hololive member and the 3rd VTuber to reach this milestone after Kizuna AI and fellow -Myth- member Gawr Gura.

On 1 April, Calliope changed her Twitter name to "YUNG SH1N1GAM1 B01," or rather Calvin Mori, who seems to be Calli's male persona. He released 4 tracks, "C-MAN," "Street FITE," "My Reality," and "MONEY (Hand Me The Glock)," with "Street FITE" being made in collaboration with Hayko, Hakos Baelz's holo -Ministry- persona. Later that day, Calli had a release party stream in her C-Man persona.

On 4 April, during her birthday, Calliope officially debuted her 3D model on her channel in a concert, during which she announced that she had signed on with Universal Music Group, with her first EP with the label titled "Shinigami Notes" to be released in July.

On 28 June, on Amelia's channel, -Myth- held their first off collab, where every member was present.

On 21 July, Calli held her first major solo concert "New Underworld Order."

During the concert Calliope also debuted her second 3D costume. In this costume she uses a black hat, headphones and various chain necklaces one of them has an ornament that reads "Reaper." Calli wears a black jacket with a partially see through red T-shirt with a golden edge and black decorations. Her pants are partially torn below her right knee, the pants have two belts one is black and golden and the other one is red and is falling to the side from left to right and is also decorated with chains. She wears low black boots.

On 9 September, during a stream, Calli announced her "Official International Online Shop," which was also the first online store exclusively made for overseas artist affiliated with UNIVERSAL MUSIC JAPAN.

On 23 September, Calli and Watame debuted their second duet original song "Reaper vs. Sheep." The song has two versions: the "-Ouen ver.-" and "-Kenko ver.-"

On 10 October, Calli announced during a stream that she would release a new album "Sinderella" on 16 December.

On 1 February, hololive production English Twitter account announced that Calli would get her fifth 2D costume.

On 6 February, Calli debuted her fifth 2D costume. Calli has two different hairstyles, in one she uses long twintails, in the other she has long loose messy hair, both hairstyles are compatible with some accessories including a skull hairpin, a sleep mask and her regular crown. Calli wears a black sighly see through nightgown with lace on the cleavage and bottom. Below her chest a red ribbon. Calli wears slippers resembling Death Sensei.

On 25 February, Calli officially debuted her 3D model on her YouTube channel.

On 9 March, Calli debuted two new hairstyles for her second 2D costume. In the first one she uses a bob haircut similar to her original style. In the second one Calli uses loose hair with her bangs styled to the sides. Both hairstyles can be combined with the outfit's previous accessories.

On 19 March, Calli debuted her 3D idol costume during hololive 4th fes. "Our Bright Parade" DAY2.

On 28 March, Calli announced on her Twitter account that she would get her sixth 2D costume.

On 1 April, Calli debuted her sixth 2D costume. Calli uses her standard hairstyle and has the option to wear a black hat with a wine color underside and silver skull badges. She has a black choker. Calli wears a sheriff outfit. She uses a light pink blouse with a black ribbon around the collar and a corset. The corset has crossed straps and is decorated with some badges including two crossed revolvers, a dead beat with a hat and triple stars. Calli uses black shorts with a belt falling from the right to the left. On top of it, she wears black chaps carrying two holsters with revolvers in them. She has black boots. Calli can also wear a black leather coat with the official sheriff badge of the Underworld. On her right hand, she can hold a shotgun with a blade under the barrel, but she can also use that hand to make a hand gun and thinking gestures.

On 2 July, she participated in "hololive English 1st Concert Connect the World."

On 5 July, Calli announced on her Twitter account that she would get her seventh 2D costume.

On 8 July, as part of a collaboration with ONE PIECE and to celebrate the volume 106 theme song "Mirai shima ~Future Island~" that she sings, Calli debuted her seventh 2D costume based on Jewelry Bonney's from chapter 1063. Calli uses a headphone on her left ear. She wears a black, tight, futuristic bodysuit with long sleeves. On her left, the bodysuit has the letters "VP" that stand for "Vegapunk." Calli uses long, black boots.

On 9 July, as part of the "hololive Summer 2023" event, Calli debuted her 3D. These are the same designs that Japanese members debuted the previous year.

On 30 July, as part of the "hololive Summer 2023" event, during a karaoke relay, Calli debuted her 3D swimsuit. The 2023 swimsuits are inspired in a sailor uniform. Members wear a two layered swimsuit, the first layer is blue from the straps going down diagonally to the center where each member has a mostly blue bow but one of the sides and the brooch are in one color representative of each member. The rest of the top is white. The edge has a semi circular cut. The lower piece of the first layer has two variants, one is a two layered blue skirt decorated with a white belt, a golden chain with some decorations hanging from it and a bow to the left and planks to the right. The second version is mostly the same but they wear blue shorts instead of a mini skirt. The second layer of the outfit is a matching striped bikini in white and another color depending on the member.

On 18 August, Calli released her fourth EP "JIGOKU 6". Calli also debuted a new 3D model based on her design used in the EP's cover during a live. She named it "JIGOKU Mori" but the concept illustration calls it "JIGOKU Calli." She has an oversized, black, floating crown with a red outline that Calli said is her queen of darkness crown. Calli wears a black hoodie with puffy sleeves with red and golden elements. She uses a patched body suit. Her pants are black and are mostly covered by red chaps. She has black boots.

On 14 March, Calli announced the upcoming release of her first anime ending theme, "Go-Getters," for the upcoming 2024 anime "Suicide Squad ISEKAI."

On 18 June, Calli unveiled her updated 2.0 Live2D model. Her model has improved movement.

On 16 August, Calli debuted her second major album, "PHANTOMIME."

On 31 August, as part of the ENigmatic Recollection project, hololive English members debuted a new accessory for their main 2D costumes. They wear the white and blue cloaks first seen in the project's introduction video and related concept art. The cloak includes a blue gem containing a symbol that represents their affiliated guilds.

On 5 September, Calli debuted her eighth 2D costume. She has new hairstyles: long loose hair with bangs covering her left eye and locks which fall to the front, with some of her locks dyed black; and medium leight hair with a straight cut bangs, thin twintails, and some of her locks dyed red. She can also use her bob haircut from her New Year costume. She wears a rocker-bunny girl inspired costume, as she can use a bunny girl headband and has a necklace resembleming the skull of a rabbit. She has a black corset with blue strings, black shorts with a blue belt, ripped black stockings, and black sneakers. She also has a blue jacket with pink inside and a black fluffy collar and headphones. She can hold a bass shaped like her scythe. Her cat Tutu can sit on top of her head and mimic her emotions. She also released the MV of her song "Go-Getters."

On 2 October, Calli debuted an update for her main 2D model. She gains the ability to take off her cape, a new arm pose, and some new expressions.

On 24 October, she debuted her 3.0 Live2D model, surprisingly only four months after her 2.0 model. With this new model, Calli has a lot more movement. New features include the ability to change the appearance of her eyes (sparkly, heart eyes, remove the shine, or become redder), cry, stick out her tongue, wave her hand, use a keyboard, hold a controller, use a drawing tablet, and make emotes such as hearts or an exclamation mark. She also announced an upcoming new 3D model to be debuted at her live concert "JRAP in Jigoku" on 31 October, and published a music video for "Lose-Lose Days."

On 31 October, during the "JRAP in Jigoku" live, Calli debuted a new main 3D model.

On 22 November, Calli announced her second solo concert GriMoire, to be held on 26 February 2025 in Los Angeles. This would be the first hololive solo concert outside of Japan. She also debuted the MV of the song "DONMAI."

On 20 December, Calli and other members debuted their 3D Santa costumes. The costume has two versions, white and red.

On 12 January, during an endurance karaoke stream, Calli reached 2,500,000 YouTube subscribers. This makes her the 7th hololive member and also the 2nd member in -Myth- to reach the milestone.

On 13 February, Calli debuted her ninth 2D costume. Calli has a variety of hairstyles, long, wavy hair with a side ponytail, her inner locks are white, in the other she has short hair, both styles can be complemented with white flower-shaped ribbons and a blue headband. She can also use her original hairstyle. Calli wears a shoulderless, long sleeved, white shirt with golden buttons and a black ribbon in the collar. The sleeves have a flowerly lace pattern. She uses a pink or blue high-waisted skirt. She has a black leg belt. Calli uses shiny, black, strap, high heels. Calli can also wear a blue sweater that says "Underworld University," hold a Death Sensei plushie and use white frame glasses.

On 26 February, Calliope held her second solo concert GriMoire at the Hollywood Palladium. This is the first solo concert of a hololive talent outside of Japan. During the concert Calli also debuted a new 3D costume with the same design seen in the promotional material. She has a long ponytail decorated with a black ribbon, to the sides she has two pairs of haipins. Calli wears a black corset dress with lace sleeves. The dress has a cleavage window with a golden outline. Below the chest, the dress has crossed belts with golden buckles. The dress is complemented with a short, black jacket with a fluffy collar and cuffs that can be removed. The collar has a golden brooch with a red jewel. The skirt has a red interior. Calli has black, lace socks and boots.

On 8 March, she debuted her hololive 6th fes. Color Rise Harmony 3D idol costume during the event's day 1 STAGE 2. The costume has some variants, it can be black or white, complemented with a color representative of the talent. The midriff can be covered or not. One has variant has a skirt while the other uses pants, with one leg exposed. Aside for the design featured in promotional material, the costume also includes a short jacket.

On 12 April, Calli participated in the opening ceremony of the World Expo 2025 Osaka, during the "Matsuri" performance. The event was attended by the Japanese Imperial Family, Japanese Prime Minister Ishiba Shigeru, and foreign dignitaries from several nations, making Calli's performance the first time a VTuber has performed before heads of state.

On 12 September, during Myth's 5th anniversary, Calli debuted a new 3D costume. Calli has straight hair falling to her shoulders, using a black beanie. She wears a sleeveless, black bodysuit with a zipper and a decorative slim chain belt. She uses black shoes. Calli can wear a leather-like black jacket with a red inner, on the back it has a skull printed. She also released an original song "Orpheus."

On 13 September, as part of their 5th anniversary, -Myth- members debuted a new hat accessories. Calli has a skull shaped hat for her ninth 2D costume.

On 20 November, Calli released a new original song titled "Gold Unbalance," featuring, and debuted a new 3D costume that she used in the music video. She also announced her third major album "DISASTERPIECE."

On 16 December, Calli's main 3D model was updated. Her new model features more facial expressions.