Doppel

Doppel’s base form features tanned skin, long white hair, black sclera with yellow irises, and a petite frame.

Her height is 129 cm and she weighs 25 kg.

Her measurements are bust 64 cm (A cup), waist 48 cm, and hips 71 cm.

Doppel’s age is unspecified, but her birthday is May 30 (Gemini).

Her physical form can freely change in height, build, and other traits due to her shapeshifting powers.

She is generally nude, as her clothing in any form is made entirely from her hair, though she consistently covers important parts with her adaptable hair.

Doppel is carefree, whimsical, and enjoys pulling pranks—sometimes borderline inappropriate ones.

She’s fond of teasing others, making sharp comments that are often verging on too much, but usually stays just within the line of what’s acceptable as a joke.

She’s not the typical civil servant, openly stating that she chose the job because “with bad guys, you can do whatever you want.”

She likes to spend her off time hunting down people violating interspecies laws to prank and punish them, purely for fun.

Though she likes to act mischievous, she sometimes helps her boss, Kuroko Smith, with stress relief by mimicking her form and personality.

Doppel’s real name is a series of unpronounceable sounds, so she simply uses “Doppel,” the well-known term for a doppelganger.

She joined MON as Kuroko Smith’s subordinate, utilizing her talents for transformation and infiltration for special missions.

Her personality doesn’t fully match a typical government agent, yet her powers and love for mischief find a perfect outlet in tackling criminal cases.

Doppel is a shapeshifter—she can perfectly transform into anyone, human or non-human, down to the smallest detail.

Her powers also allow her to reshape her body size and proportion, making her the ultimate infiltrator.

Her hair is extraordinarily versatile: stretchable, morphable, and strong, it serves as clothing, furniture (like a chair or hammock), and protection for sensitive areas.

Making use of these skills, Doppel often impersonates hostages or suspects to lead criminals into traps or to lull them into lowering their guard.

Since she is not a true doppelganger in the traditional myth, people don’t die when they meet her in another form.

Her features, such as “facelessness,” “mocking attitude,” “tentacle-like hair,” and “pitch-black skin” make her notably similar to the mythological “Crawling Chaos.”

Doppel refers to Kimihito Kurusu as “boyfriend!” showing a fondness for teasing him about his earnest, uptight manner.

She is an enthusiastic and mischievous member of the MON team, engaging with her colleagues but sometimes leaving them in the dark regarding her pranks.

Her sense of humor is often on the edge; she’s skilled at pushing limits without quite crossing lines.

She was responsible for the “Threat Letter D” incident, planning the whole mess as a prank (with Kuroko Smith's approval) but clearly enjoying herself too much.

She only goes by “Doppel” because her real name is literally unpronounceable.

In her spare time, she’s known to take the law into her own hands for amusement by pranking lawbreakers.

Despite her otherworldly, somewhat intimidating look and quirky attitude, she’s actually indispensable to MON for undercover operations.

“If you’re bad, you’ll get pranked—simple as that!”

“Hey, boyfriend! You’re way too serious, you know?”

MON Operations and Pranks

As a MON member under Kuroko Smith, Doppel takes on dangerous footwork in criminal investigations, often using her powers to impersonate targets or hostages.

In one case, she caused a ruckus as the orchestrator behind the “Threat Letter D” incident, for which even her teammates were kept in the dark.

She uses her abilities not only professionally but also to help Kuroko Smith decompress from stress, by mimicking her.

Daily Life and Antics

Doppel’s leisure activities revolve around identifying and teasing offenders of interspecies exchange laws.

She has an unquenchable appetite for fun and will often use her abilities to prank others, always covering herself with her versatile hair and never actually appearing in normal clothes.

Her interactions with Kimihito Kurusu are filled with playful teasing, especially regarding his strict and earnest attitude.

Doppel’s overall design and abilities hint at inspirations from cosmic horror and mythology, especially traits associated with “Crawling Chaos.”

She fits right into the world of Monster Musume: Everyday Life With Monster Girls, adding a playful yet mysterious dynamic to the team.

Though her methods are unconventional, her results on the MON squad speak for themselves.