The weary protagonist of the Type-30 UTAUs. Usually serves as the UTAU manager. Favorite manga is "Number Five." Shooting and singing are two sides of the same coin. Also acts as Rei Adachi's guardian. — Personality and traits in the creator's works: Called "Type-30 Uta Utane," she has a deep complex about her "eyes." Because of this, she has a habit of stubbornly pretending to be "normal" in front of others, making her very clumsy and delicate. She tended to build walls around herself, but after meeting Rei Adachi, she became able to show her "true emotions" without hiding herself, only when she is with Rei. Sometimes calls Teto "Chimera" or "Old Hag in her 30s." — Official Specs & Visuals: • Height: Around 155cm (approximate setting) • Appearance: Purple short hair, a black beret (school cap style), and coat-like clothing. She has a traditional "Early UTAU" style that looks somewhat expressionless and cold.

The self-proclaimed poster girl of the Type-30 UTAUs. Active in Synthesizer V as well. UTAU is her home. Motto: "Just being alive is a huge profit." Every day is a HAPPY Chimera life ♥ followed by a total lack of empathy. She and Uta Utane are in a long-standing, inseparable relationship. — Personality and traits in the creator's works: An old friend of Uta and Momo. In Satou no Kanzume's slice-of-life manga and illustrations (such as "The UTAU-ers"), she is a character who combines a big-sisterly nature with a somewhat comical brightness, subtly looking out for Uta's complexes. She adds "-tsun" to other characters' names. She sometimes calls Uta "O-Defoko-n." — Official Specs & Visuals: • Height: 159.5cm / Age: 31 (age as a chimera) • Appearance: Reddish-pink drill curls. Wears a military-style outfit based on gray and red.

The 2.5D BABY of the Type-30 UTAUs. Growing up healthy thanks to Uta Utane's devoted protection. Favorite song is "Monster's Ballad." A sparkling, pure, tottering robot. Momo Momone is someone she can actually talk to. — Personality and traits in the creator's works: While having an identity as an inorganic synthetic voice/robot, she is depicted as a very pure and straightforward existence. When Uta is about to close her heart by obsessing over being "normal," Rei stays by her side with a purity free of calculation or prejudice, becoming the "only place where Uta can be her true self." — Official Specs & Visuals: • Height: 158cm • Appearance: Bright orange hair (side ponytail) and cybernetic clothing (white and black base) featuring exposed mechanical parts like speakers and servo motors.

In charge of housework and daily life for the Type-30 UTAUs. Because she is a helper robot, worrying about her or helping her is NG... if you do, you're "banned." Hobby is "collecting picture books." Everyone's ultimate weapon of reassurance. The only person Teto Kasane cannot defy. — Personality and traits in the creator's works: While giving off a gentle and airheaded vibe, she appears as a kind and calm mediator who quietly watches over her own existence as a robot and the clumsy relationships of her friends (Uta, Rei, Teto, etc.). — Official Specs & Visuals: • Height: 150cm / Personality: Gentle, airheaded, a bit clumsy • Appearance: Long pink hair with a headset. A neat visual in a maid-style outfit based on green, pink, and white.

A character with a slightly special background, possessing both male and female voices. — Personality and traits in the creator's works: Shows a dry, boisterous mischievousness that perfectly matches Satou no Kanzume's somewhat ennui and nostalgic worldview. Often positioned as someone involved in the human (or robot) drama of Uta and the others from a slightly downer, detached perspective. — Official Specs & Visuals: • Height: 197cm (quite tall) / Gender: Intersex (ratio of 1:9 male to female, etc.) • Appearance: Black hair in twin tails, distinct heterochromia (right eye blue, left eye red). Wears stylish and punky bell-bottom style outfits based on black.

One of the "oldest UTAUs," a character with a cult following created by Ritsu Namine's voice provider (Canon). — Personality and traits in the creator's works: Satou no Kanzume pours strong respect and love into these "early UTAUs" and "characters hidden in the shadows of history." In the works, like Uta and the others, she is quietly depicted as an existence with the melancholy and pride of old technology and speech synthesis, moving at her own unique pace. — Official Specs & Visuals: • Height: Around 150–160cm (approximate) • Appearance: Long orange hair. A simple and transparent visual wearing a sailor suit or a slightly retro blue, green, and yellow outfit inspired by waves.

Originally planned on the 2channel VIP board as a "character to surpass Miku Hatsune," she is the epitome of a yandere character. — Personality and traits in the creator's works: Rather than depicting the original setting of extreme "yandere and passion" toward "Len-kyun (Len Kagamine)" in a raw way, through Satou no Kanzume's filter, she is portrayed as a girl with a somewhat lonely and emotional inner self—someone whose obsession with others (a specific person) is abnormally strong, making her terribly lonely and clumsy. — Official Specs & Visuals: • Height: 171.2cm (tall with a great figure) / Age: 19 • Appearance: Long silver-white hair with sharp eyes that look like they have red eyeshadow. Her outfit looks like a beautiful, classic idol style based on white and black at first glance, but it's a smart design that feels "sickly" and dangerous in places.