On 16 January, Bijou debuted her third 2D costume, named 81800. Bijou has two hairstyles, bob haircut and high-long twintails, both have her bangs covering her left eye which can also be covered by a black eye patch. On her face, she can also use various band aids. Bijou wears a strap, black top with various belts and frills. She uses a black, miniskirt with a big zipper to the side with a black, diagonal belt that carries a katana. Bijou has asymmetrical socks in black and gray. Bijou uses sneakers covered in gems. Bijou can wear a black jacket with a GEOW shaped hoodie, the inner is litmus blue, on the front the jacket has some patches including a Moai and the 81800 code. She can also hold her katana but not unsheathe it.
On 27 February, during an Advent's friendship test collab featuring their casual costumes, each member had a hairstyle swap. Bijou has Mococo's main hairstyle including the dog ears.
On 28 February, Ina, Bijou, Gigi and Raora debuted new Palico mascots as part of a sponsor by Monster Hunter Wilds.
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 22 March, she reached 800,000 subscribers on her YouTube channel.
On 1 April, Shiori, Nerissa and Bijou, debuted buff 3D models.
From 17 June until the end of the month, Bijou took a two-week hiatus for a work-related trip and a holiday trip. Pebbles referred to it as an absence of almost 140 years. Raora took care of John Cat in her absence.
On 29 July, Bijou debuted new expressions for her 3D model.
On 4 August, -Advent- announced a project to celebrated their second anniversary, including "The Story of Advent", a five chapter series corresponding to five original songs about the journey of them, a holo no graffity episode, and a 3D live "On the Run!" on 29 August. A prologue video and their third original song "Genesis" were released on the same day.
On 29 August, during their second anniversary live "On the Run!", -Advent- debuted their 3D swimsuits first introduced in the hololive Summer 2023 event. 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 17 October, Bijou debuted her third 2D costume as a new 3D costume in VRChat. She also announced that she would be doing a 3D live on 1 November.
On 1 November, Bijou debuted her second original song "ROCK IN!"
On 4 November, she reached 900,000 subscribers on her YouTube channel.
On 15 November, Bijou held her first Twitch stream, reaching 1,944 viewers at peak.
On 15 December, Bijou and Ina debuted new 2D costumes as a part of a collaboration with the game Monster Hunter Wilds. This is Bijou's fourth 2D costume. She has loose, messy hair with dark purple tips, decorated with dark ribbons, she can use a headband with purple horns. Bijou wears a crossed strap, black dress. She has long, black, leather boots, with gems in the tip that resemble claws.
