Calliope

The Grim Reaper's first apprentice. Due to modern medical care causing a decline in the reaping business, Calliope decided to become a VTuber to harvest souls instead. It seems that the ascended souls of the people who are vaporized by the wholesome interactions between VTubers go to her as well. That being said, despite the image her hardcore vocals and manner of speech gives off, she's actually a gentle-hearted girl who cares greatly for her friends

The Grim Reaper's first apprentice. Because the world's medical system advanced so dramatically, Calliope became a VTuber to collect souls. It seems that the lost souls vaporized by the wholesome relationships of VTubers flow through her as well. In the end, she's a gentle-hearted girl whose sweet voice contradicts the morbid things she tends to say, as well as her hardcore vocals

The Grim Reaper's apprentice has displayed throughout her streams, guest appearances, and music to a have cool, yet serious personality, with a timid side being seen when interacting with others for the first time, such as her senpais. Calli's cool attitude can be clearly observed in most of her streams, as she tries her best to impress her fans with her musical talent and occasional gaming skills.

However, she is not afraid to get serious about topics that may be on her mind, and engages in thoughtful discussions with viewers. This combination of a relaxed yet serious personality has earned her the admiration of not only her fans, but also the other hololive talents as well.

However, Calli's playful side comes out more evidently during collaborations with her genmates, displaying a side of Calli which viewers don't regularly experience. Calli still remains above all an avid hard worker who is regularly working on projects behind the scenes, often not sleeping for long periods of time. Despite the challenges that she may face while working on these projects, each one is very much rewarded and appreciated by her fans each time a new original song or cover is released.

Calliope is equally excited by both rapping and "reaping." Her favorite weapons include her scythe (nicknamed "Ricky") and the flail, a medieval weapon made from a spiked metal ball on a chain.

Calliope is noted for having one of the most lowest pitched voices in hololive, even more so than likes of Nekomata Okayu, Tokoyami Towa and A-chan. Although fluent in English, Calliope often fails to understand current modes of speech, such as the use of contractions or modern slang. She is easily flustered by romance, leading some to call her the "tsundereaper."

When not on camera, however, she is described as air-headed and hopelessly forgetful. Kiara has mentioned that she frequently misplaces things despite leaving them in an obvious place, like leaving her cellphone in her jacket. She also works exceptionally hard, perhaps too much so.

She has long, straight pink hair with a small black crown with a transparent veil and pink eyes. She has a black cape with sharp white teeth.

On 23 April 2020, following the success of the Japanese-language hololive VTuber group, Cover Corporation announced auditions for English-speaking members. The initial round of auditions ran until 24 May. Mori Calliope first heard of hololive after seeing clips on YouTube, particularly the infamous Natsuiro Matsuri band-aid story. She heard of the hololive English audition from friends. She began watching hololive videos in her work breaks to familiarize herself with the other members, and became excited at the possibility of joining them. Calli had previously spent several years making music with an audience of no more than twenty people.

Calli auditioned by describing her best traits and skills and taking a professional tone. She credits her success to her hard work and willingness to take chances on new opportunities. After she was selected, it took some time for Calli to accept that she had been successful. The members of -Myth- began training around June 2020, three months before their debut. Calli's YouTube channel was created on 16 July, and her Twitter account was created in the same month.

On 8 September 2020, Mori Calliope was first revealed in a short promotional video alongside the other four members of hololive -Myth-. A simultaneous announcement was made at the hololive Twitter account, and the hololive English Twitter account. She made her first tweet the same day.

Calli made her debut stream on 12 September 2020. She was the first member of hololive -Myth- to debut. She performed the premiere of her first original rap song, "失礼しますが、RIP♡" or known in English as "Excuse My Rudeness, But Could You Please RIP?." The song was released on her YouTube channel the same day.

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 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 shawl. 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.

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