A-set

A-set is a cheerful and optimistic girl who approaches life with enthusiasm. She began dancing at an early age, and later in her childhood picked up interests in gaming, movies, Egyptian mythology, and the occult. She maintains an interest in urban legends and unsolved mysteries, occasionally discussing these topics on YouTube and social media.

She has a strong relationship with her mother Hitomi, who she considers the most important person in her life. Her best friends are Okiura Mizuki (沖浦 みずき) and Matsushita Ota (真津下 応太). Ota considers himself one of her biggest fans and interacts with her via his own Twitter account.

She has short pink hair split into two short pigtails ending below her shoulders, and her eyes are light blue.

Her outfit consists of a long sleeve shirt, two layered jackets, a fanny pack, blue socks on pink heels, and a cat-ear headset. Her t-shirt is white with long blue sleeves. Her button-up sweater is blue with long sleeves that end in fingerless gloves. Her letterman-style jacket is pink and white and features the "A" of her A-set logo on the back and the left breast side. Her fanny pack is cat-themed and is named after Bastet, an Egyptian goddess typically depicted as a cat. It is features a yellow and blue cat face, and the bag portion sits on her back. Her headset is black and white and features two cat ears.

• She is a fan of various real-world media properties, including JoJo's Bizarre Adventure, Danganronpa, Pokémon, Super Smash Bros., and Steins;Gate. She also frequently expresses her love for the fictional game ShovelForge.
• An official LINE sticker pack (Japanese) is available featuring her.
• Her single, Invincible Rainbow Arrow, debuted with her in her first YouTube video. The full version was later made available on the album "AI: THE SOMNIUM FILES Complete Soundtrack -RaiNBOW AFFaiR-".
• The actual Somnium Files game contains numerous inconsistencies with the events depicted in the videos alongside the accounts, most notably with her description of Naixatloz. Seemingly due to the decision of turning her a VTuber happening very late in development.