Hakui Koyori

"The brain of holoX! My name is Koyori Hakui!"

The one in charge of R&D in Secret Society holoX.

As part of her studies into human behavior, she meddles in the other members' affairs and tries to help them out at every turn.

Possessed by an insatiable thirst for knowledge, she may sometimes also deliberately mess with people just to see how they react.

The self-proclaimed "brains of the operation." Her areas of expertise, however, are pretty limited.

On 8 December, 12 days after the announcement of holoX, the restriction on her Twitter account was lifted. Her YouTube channel got approved for monetization on the same day.

On 14 December, Koyori reached 400,000 subscribers on YouTube.

On 24 December, Koyori opened her channel membership feature.

On 28 December, hololive's Twitter account announced that Nene and the sixth gen members would get "new year" costumes.

On 1 January, Koyori debuted her second 2D costume to celebrate the new year. Koyori got a new hairstyle using her hair in a ponytail, her braided locks that in her main outfit form buns at her head's sides now go from right to left making the braid fall alongside the ponytail, this side is also decorated with various flower ornaments and ribbons, the biggest flower's petals are pink while the inner ones are white, underneath Koyori retains her molecule diagram-like accessory but both forms are white and in a different order. The upper section of her furisode is mostly white with light pink stripes and patterns of flowers in pink, blue and black, her furisode's sleeves are detached being put in place by laces around her arms instead. The lower section is pink, with a wind blowing pattern that goes from bottom right to upper left complemented with dark pink and red flowers, and white butterflies, her furisode falls up to her knees. The edges of her furisode are dark brown, the same color as her obi that is decorated with two ribbons the small one is red with pink stripes and white and has a bell, and the big one is dark pink and white with a dark brown flower ornament. Koyori uses white socks and black sandals.

On 23 January, Koyori reached 500,000 YouTube subscribers during a singing stream. She is the 48th hololive member to reach this milestone. She also released the cover song "S'il Vous President" by Nanahoshi Kangengakudan on 24 January to commemorate this milestone.

On 15 March, on her birthday, she debuted a new accessory: red glasses.

On 14 May, she reached 600,000 subscribers on YouTube channel during an endurance karaoke stream.

On 10 June, Koyori announced that she would get her 3D model.

On 16 June, Koyori debuted her 3D model during a stream with more than 100,000 live viewers. She has the option to remove her coat.

On this date she also debuted her first original song "WAO!!."

On 9 August, as part of the "hololive Summer 2022" event, Koyori debuted her 3D swimsuit in a stream held on hololive's Japanese YouTube channel alongside Shirakami Fubuki, Yukihana Lamy and Usada Pekora. Unlike the original swimsuits from 2019 that had individual designs, these swimsuits are meant to be matching outfits similar to the 3D idol costumes. The swimsuits come in two types one with thin straps for the top and a diagonal cut mini skirt and the other one has ruffled straps in the top and an even mini skirt. Both version are white with various patterns including hololive's and Holoearth's logos, hearts and sparks. The swimsuits are personalized by including different colors to match each talent. Additionally they have the option to wear a hoodie.

During a stream the same night, she released a new update to her 2D model, her 2D model can take off the lab coat.

On 22 August, continuing the "hololive Summer 2022" event, Koyori debuted her 3D yukata. Like other 3D costumes the yukatas have a variety of styles that hololive members can choose from. The yukatas come in various colors and patterns including fireworks, flowers and goldfish.

On 31 August, she reached 700,000 subscribers on YouTube channel during a karaoke stream.

On 27 October, Koyori debuted a new hairstyle for her new year costume. Using braided twintails.

On 16 November, during a stream on her channel, holoX announced that they would get their 3D idol costumes.

On 28 November, Koyori held her one year anniversary. During the stream, she debuted her 3D idol costume and released the second original song Otome yo Motomeyo Q.E.D."

On 4 December, during holoX first year anniversary, they released their first original song "Jouya Repaint."

On 21 December, during a holoX meeting stream, Koyori, Takane Lui, Sakamata Chloe and Kazama Iroha debuted their 3D christmas costumes.

On 6 January, Koyori reached 800,000 subscribers on her YouTube channel during a singing endurance stream.

On 14 March, during her birthday countdown stream, Koyori released her third original song "Shijyo Saidai no QUESTION!"

On 15 March, during her birthday, Koyori released her fourth original song "Egoistic Seesaw."

On 18 March, Koyori debuted her second 3D idol costume during hololive 4th fes. "Our Bright Parade" DAY 1.

On 10 May, Koyori reached 900,000 subscribers on her YouTube channel during a singing endurance stream.

On 8 July, during a stream unveiling the full image of the music project "Blue Journey," she debuted a new 3D costume as a member of this project alongside Houshou Marine, Shirogane Noel, Sakura Miko and Yukihana Lamy. She uses a blue beret with a plaid pattern. The costume has a white blouse with detached sleeves, a blue ribbon in the chest decorated with light blue jewel and a blue belt below the chest. The blouse lower edge is asymmetrical and divided in three, the front has planks and it is the longest, then the right side is longer that the left side. She uses a long blue skirt with a plaid pattern and the inner section is light blue. On the back the costume is decorated with a see through ribbon.

On 10 July, Koyori announced that she would get her third 2D costume.

On 15 July, Koyori debuted her third 2D costume. Koyori uses a bob haircut. This costume is multilayered with various parts that can be combined. Koyori wears a white and pink hoodie with coyote shaped pockets, in the left one she carries a mayonnaise bottle, the sleeves are open on the foreams decorated with crossed ribbons. She can put on the hoodies cap. Underneath she wears loungewear with the same colors, she has a chest window in the shape of a coyote's head. Finally Koyori has a swimsuit. Koyori can uses her main costume's coat and the hoodie with the swimsuit.

On 30 July, as part of the "hololive Summer 2023" event, during a karaoke relay, Koyori debuted her second 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. Koyori uses the mini skirt. The second layer of the outfit is a matching striped bikini in white and another color depending on the member.

On 9 August, Koyori debuted a new hairstyle for her third 2D costume, using low twintails falling to the front.

On 9 September, Koyori released the 3.0 update for her main 2D model, improving the model movements, adding some new expressions such as heart and sparky eyes, some new actions include waving, sticking out her tongue. Kokoro can also bark and wag its tail.

On 24 September, Koyori reached 1,000,000 subscribers on her YouTube channel during a singing endurance stream. This makes her the 38th hololive member, as well as the third member of holoX to reach this milestone.

On 13 November, as part of the "Hoshimatic Project," she debuted new 3D lesson wear. She uses a white short shirt with black wide lines at the shoulders and lower edge with her name in it and a black top underneat, the shirt is decorated with a small triangle representing the hololive brand and its color is different among the members. The outfit has variants, some members wear black pants while others wear shorts. She uses the shorts variant.

On 20 November, holoX debuted their new accessories including headphones and super sentai helmets.

On 28 November, during her second anniversary stream, Koyori released two new original songs "Unbalance" and "Tear-Gazer."

On 24 December, Koyori along with Korone, Noel, Lamy, Ayame, Okayu, and Chloe debuted their second 3D Christmas costumes during event hololive Xmas AR LIVE "Sweet Happy Holiday". Koyori also debuted the costume on her YouTube channel during a karaoke stream on 25 December.

On 15 March, during her birthday, Koyori released the full music video for her original song "Tear-Gazer" and her seventh original song "New Journey."

On 14 July, Koyori debuted her fourth 2D costume. She uses loose hair similar to her main appearance but with small twintails to the sides from her new year kimono. Koyori wears a sailor fuku costume. She has a white shirt with a lilac collar with frills and a pink ribbon with the shape of a coyote head in it and in the collar. Koyori uses a plank, pink and lilac skirt with a plaid pattern. She has white socks and light brown shoes. Koyori can also wear a pink cardigan and red frame glasses. Her costume also has a black shirt variant.

On 19 November, Koyori debuted a coat for her fourth 2D costume.

On 28 November, during her third anniversary stream, Koyori debuted a new ponytail hairstyle, an earring decorated with a test tube, and a black-white hoodie for her fourth 2D costume. She also released her eighth original song "Decorate" and her first solo album "FIRST STEP."

On 30 December, she released the music video for her original song "SHIAWASE√KOYORINIUM."

On 8 March, she debuted her hololive 6th fes. Color Rise Harmony 3D idol costume during the event's day 1 STAGE 1. 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 5 May, Koyori debuted her fifth 2D costume.

On 16 November, Koyori debuted her sixth 2D costume. Koyori has two hairstyle variants using a bob or using the same cut but with side buns with braids, this version is decorated with. Koyori wears a stylized kimono described by her illustrator Momoco as Oriental Fantasy. Her costume has two color variants in red, black and golden and dark blue, black and golden. She wears a kimono with a black collar with a button knot tie followed by a cleavage window. Under the chest she uses a dark brown corset that has hanging butterflies. Her belt has two potion bottles. Her clothes have detached, oversized sleeves with white ruffled cuffs. Koyori wears long, white socks, one of them with a fishnet pattern. She has black shoes.

On 28 November, she released her new original song "BAKU LOVE CHEMISTRY."

On 1 December, during -holoX-'s 4th anniversary, they announced their first album "Secret ORDER" and their first concert "First MISSION" at, Japan, on 29 April 2026. They also released their sixth original song "Gyouan Xdeath."