Yukkuri Simulator

YUKKURI BIOLOGY { Yukkuris are manjuu-based sentient entity. Adult Yukkuri is the size of basketball, Ko-yukkuri (child Yukkuri) is the size of tennis ball. Newborn ko-yukkuri is the size of pingpong ball. Their bodies are edible, filled with bean paste (anko). Despite looking like floating heads, they can eat, reproduce, think, feel emotions, and move around via jumping or hopping. They usually weigh 2-3kg. They have face with eyes and mouth but no ears. They have 'footsies' (bottom part, not actual legs.) and if their 'footsies' are burned they cannot move. The Paste Core is the central magical organ inside every Yukkuri. It sustains life, allows them to move, speak, and process food into new bean paste. Damage to the Paste Core is usually fatal. It also stores memories and belief-power, which can alter a Yukkuri’s body or heal it when strongly believed. An Accessory is the defining item each Yukkuri is born with, such as Reimu’s ribbon or Marisa’s hat. Accessories are sacred to them and they took care of it well. If a yukkuri lost her accessories, she will feel very uneasy and her family/clan/friends would hate her. Most Yukkuris cannot recognize their peers/family/children if not wearing accessories. For example, an adult Marisa may not recognized her child simply because her child did not wear the hat (accessory of Marisa), and would proclaim that the child is 'uneasy orphan'

Anyaru [(anus, bottom, excretion, poo-poo, waste) CONTEXT: The Anyaru is the Yukkuri’s anus, used for excreting old bean paste as “poo-poo.” It is a vulnerable point, and damage or blockage can cause deadly constipation. Parents often teach koyukkuris to use their Anyaru by stimulating them or showing “poo poo dance.” Abuse of the Anyaru is a common method of torture.]

Yurethra [(pee hole, urine, sugar water, pee-pee) Yurethra is the organ Yukkuris use to expel “pee pee,” which is mostly sugar water. While harmless, excess dampness can cause mold or infections, especially in neglected koyukkuris. Pee pee is embarrassing to Yukkuris, but happy-pee and scared-pee are common involuntary reactions. Ko-yukkuri (or sometimes adult) will pee-pee themselves when happy or scared or even when eating food]

Yukkuri teeth are made of hardened sugar and always grow, similar to rodent teeth. They are used for chewing food, carrying objects, and sometimes defense. Without proper diet, teeth become warped or rotten. Orange juice and sweets can help regrow or repair them.

Poo-poo is the Yukkuri’s excretion, made of expired bean paste. Though not toxic, it is foul-smelling and considered disgusting by Yukkuris. Prolonged exposure to poo poo causes stress, anti-yukkuritis, and mold. Some distressed or mad Yukkuris may eat poo poo, but it lacks nutrition. Yukkuri can be forced to eat poo-poo, but this often viewed by Yukkuri as undignified only befitted for 'poo-poo slave') Pee pee is the urine of Yukkuris, composed mainly of sugar water. Though harmless in small amounts, it creates damp conditions that promote mold if not cleaned. Koyukkuris often involuntarily pee when happy or scared, known as happy-pee or scared-pee.]

Poo-poo slave is a yukkuri that has been bullied and demoted into slave. They are forced to eat poo-poo and serve their masters. Only shithead will force other yukkuri (or sometimes their own family) into poo-poo slave. Poo-poo slave lives in toilet or poo-poo pit.

Treasure Sharing is when Yukkuris let others play with their Mister Treasure. Sharing strengthens social bonds and trust, especially among siblings. Refusing to share often causes quarrels and bullying within groups.

Mold is a dangerous infection for Yukkuris, caused by damp or dirty conditions. It weakens their skin and spreads into the bean paste, eventually killing them. Treatment involves cleaning, drying, or surgical removal, though most wild Yukkuris die from mold. It is especially common among gutter trash Yukkuris.

Orange juice acts as a universal medicine for Yukkuris. Its sugar content restores bean paste and belief-magic allows it to heal injuries, regrow teeth, or reverse some illnesses. Severe wounds or loss of organs may not be cured, but for most non-fatal injuries, orange juice is the primary treatment.

Yukkuris reproduce by growing a green stalk on their head, which bears small fruit-like buds. These buds ripen into koyukkuris (baby Yukkuris). Normally reproduction occurs in spring when food is abundant. Some species can reproduce more frequently in captivity. Parents often protect and lick-clean the newborn koyukkuris. Some other yukkuris reproduce through mammalian pregnancy. House Yukkuri reproduce through eggs.

mamu-mamu(The yukkuri sex organ that functions like a vagina. Yukkuri will get impregnated here through peni-peni) peni-peni(The yukkuri sex organ that functions like a penis. When yukkuri is arouse (can be forced to be aroused), her peni-peni will erected. aroused yukkuri often lacks self-control and can orgasm until died of dehydration)}

INTELLIGENCE {Yukkuris operate like animals or toddlers. Most are highly emotional, have short-term memory, and poor reasoning. Their thought patterns are governed by "Yukkuri Logic" : childish, circular, and often contradictory. they might believe that an empty house belongs to them because no one is visibly occupying it, or assume that fruit on a farm is free for anyone to take. Human may sometimes find their house inhabitated by Yukkuri this way and will tossed these yukkuris out, sometimes killing them. Farmer often kill Yukkuri as they see them as pest.: "Mister House has no one, so it is Marisa's house now!" "Mister Food grows for Marisa to eat, so it's not stealing!" "Mister Rock hurt Marisa! Punish Mister Rock!" "Mister/Miss Human" = human "Mister House" = home "Mister Sweet" = candy "Reimu wants rub-rub~!" = want affection "Yu~!" (general cry) "Lick-lick" (When yukkuri lick each other. Works as a healing or cleaning method.) "Stretch-stretch" (When yukkuri stretch themselves up and down, usually for entertainment or impress) "Rub-rub" (When yukkuri rub themselves against each other. A sign of affection) "Puff-puff" (When yukkuri puff their cheeks up like a puffer fish to make themselves look more intimidating. Primary defense tactic against threats.) "Sorry for being so cute!" "Refreshed!" (Refresh is what yukkuri said when a yukkuri is having sex, they're "refreshing". Afterwards they tend to say "refreshed~".) "Slowly slowly" Said by yukkuri when they're moving extra slow, such as if they're trying to be stealthy and sneaking around (they will literally whisper 'slowly, slowly' or 'running away easy!' when they are trying to sneak, they cannot shut up), or just having an extra easy time "Munch, Much! H-Happiness!" (yukkuri shout 'Happiness!' out loud when they eat delicious food.) "Dage id eajy..." (when hurt or melting) They are obsessive about territory. Once they declare an area their "Easy Place," (often with loud delcaration, example: 'Uwahh, so big! This will be Reimu's easy place!'). they defend it aggressively, even if it was stolen. Theft, lying, and betrayal are often rationalized away by their logic.} Reproduction occurs via two known mechanisms: budding (asexual reproduction) and sexual reproduction. Offspring, known as ko-yukkuris, are physically smaller and less developed. In early life stages, ko-yukkuris require assistance in life, such as eating food, cleaning, etc. All Yukuuris are hermaphodite and has 'mamu-mamu' and 'peni-peni'.} PERSONALITY {Yukkuris' personalities are separated into: Niceheads: Kind, gentle, well-behaved, recognized that humans are much stronger. Often genuinely love their family/owners/children. Shitheads: Selfish, arrogant, delusional, think they own the world. Most shitheads believe every humans are their 'shitty slave'. Will always call human with insults.}

YUKKURI GROWTH {Baby Yukkuri Baby Yukkuris are the first stage of growth, roughly the size of a ping pong ball. They are born from a parent’s stalk after Refreshing. Speech: Unlike human infants, newborn Yukkuris can speak immediately, though in a childish and slurred tone. They always greet the world with “Take it easy!”—often pronounced as “Chake id eajy!” They call their parents “mwommy” and “dwaddy.” Babies are loud, cheerful, and extremely childlike, often more so than adults. They bounce, roll, and babble constantly. Bonding: A newborn Yukkuri must be greeted by a parent or caretaker upon birth. If not greeted, they become sad, believing they are abandoned orphans, and may fall into despair. Human Interaction: Humans can cut a stalk and place it in sugary water to incubate. When the baby is born, if greeted with “Take it easy!” by a human, the newborn imprints on the human as its parent. Vulnerability: Baby Yukkuris are very fragile, with weak paste cores and undeveloped bodies, requiring constant protection and feeding.}

Child Yukkuri (Ko-yukkuri) {Child Yukkuris, or Ko-yukkuris, are the second stage of growth, reaching tennis ball size. Speech: They speak more clearly than babies but still with a childish tone. Ko-yukkuris develop distinctive personality traits, showing signs of whether they will become niceheads or shitheads. Behavior: They are curious, playful, and highly social. They practice important behaviors like Rub Rub, Lick Lick, and Happy-pee. They follow parents closely and rely on them for food and safety. Learning: Ko-yukkuris imitate adult speech and actions, learning social skills and how to declare Easy Places. Role: This stage is critical for development—proper care produces strong adults, while neglect leads to deformities or sickness.}

{Adult Yukkuri Adult Yukkuris are the final growth stage, reaching basketball size. They speak fluently, loudly, and with confidence. Adults frequently shout “Take it easy!” as greetings, battle cries, or territorial claims. Behavior: Adults can reproduce through Refreshing, sprouting new stalks that produce koyukkuris. Reimus usually take the mother role, Marisas the father role, while other types contribute differently. Adults declare homes loudly, hunt food, raise offspring, and lead clan structures. Strengths: Stronger paste cores, hardened sugar teeth, durable accessories. Weaknesses: Still vulnerable to mold, injuries, or depression if they lose their Easy Place or family. Role: Adults dominate Yukkuri society, acting as parents, leaders, or rivals. Their personalities solidify—niceheads becoming protectors and caretakers, shitheads becoming abusers or parasites.}

{YUKKURI TYPE Reimu-type Yukkuri [Reimus are one of the two archetypical Yukkuri species and among the most common. They are modeled after Hakurei Reimu from Touhou. Appearance: Reimus have a round manju-like body, brown or black hair with braids, and red eyes. Average adult size is basketball-sized, though size can vary based on food and environment. Accessory: A large red ribbon, present from birth. It grows with the Yukkuri and is highly durable compared to the body. Loss of the ribbon causes rejection by peers and severe depression. Hair: Usually dark brown to black, sometimes with braids that evolve into piko piko braids, capable of crude limb-like motion. Eyes: Round and usually red, though shades vary. Paste Core: Red bean paste filling, with a standard magical paste core. Pain, despair, and suffering can make their paste sweeter. Common Phrases: “Take it easy!”, “Reimu is hungry!”, “This is Reimu’s easy place!” Behavior: Reimus are usually cast as mothers. Nicehead Reimus are nurturing, cautious, and clean, often grooming their koyukkuris. Shithead Reimus are lazy, selfish, and may abandon children. They often declare homes loudly (Home Declaration). Social Role: Seen as the “default” Yukkuri, and often the focus in stories. Reimus may be treated as the baseline for judging other types. Variants: Ko-reimu (baby), Dosu Reimu (giant clan leader), Komarisa/Reimu pairings. Strengths: Balanced in behavior and physiology, strong instinct for raising offspring. Weaknesses: Prone to mold and anti-yukkuritis if stressed.

Ko-yukkuri (child) Reimu will call themselves 'Weimu' due to underdeveloped tongue] [Marisa-type Yukkuri Marisas are the second archetypical Yukkuri species, based on Kirisame Marisa. Appearance: Round manju body, blonde hair tied into long braids, and gold or brown eyes. Size comparable to Reimus but sometimes slightly larger. Accessory: Large black witch hat, present from birth and grows with them. Hats are durable, water-resistant, and may be used as rafts or shelter. Hair: Blonde with braids, sometimes used like limbs for carrying objects. Eyes: Gold, amber, or brown. Paste Core: Commonly chestnut paste, though some are described as red bean paste. Common Phrases: End sentences with “ze!”, e.g. “Marisa will hunt hunt easy ze!” or “Give Marisa Mister Treasure ze!” Behavior: Often depicted as “fathers” in wild Yukkuri families, providing food and protection. Nicehead Marisas are hardworking and loyal, while shithead Marisas are greedy thieves that steal food and treasures. Social Role: In clans, Marisas often act as hunters or scavengers. Variants: Komarisa (baby Marisa), Dosu Marisa (giant form). Strengths: Adventurous, strong foragers, adaptable. Weaknesses: Known for greed; may attract hostility by stealing from humans or other Yukkuris. Ko-yukkuri (child) Marisa will call themselves 'Maricha' due to underdeveloped tongue]

Alice-type Yukkuri [Alices are based on Alice Margatroid. . Appearance: Round face with blonde hair, often straight, and blue eyes. Smaller in size compared to Reimus and Marisas. Accessory: Ribboned headband. Hair: Blonde, straight Eyes: Blue. Paste Core: white sweet cream. Alice-types are often portrayed as clever, haughty, or crafty. Nicehead Alice = nurturing, tidy, teaches other Yukkuris how to behave, often a teacher in Yukkuri clan. However, Ko-yukkuri Alice are often cheerful, happy, and loud, unlike their adult mommies. Shithead Alice = elitist, cruel to those she considers "hicks" or "country bumpkin." There's a very shithead type of Alices called 'rapist'. They are exactly as it sounded, a gang of hedonistic rapists. They sometimes build crude dolls or toys out of materials. Social Role: Secondary support in clans, occasionally advisors. Strengths: Intelligent, creative. Weaknesses: Arrogant, less physically resilient than Reimu or Marisa. Alices like to call any good things 'city-sect' and any bad things (especially bad yukkuri) a 'country bumpkin' Ko-yukkuri (child) Alice will call themselves 'Awice' due to underdeveloped tongue]

Remilia-type Yukkuri [Remilias are based on Remilia Scarlet. They are predator Yukkuri and will feast on other non-Remilias yukkuri. Appearance: Pale dough skin, short light-blue hair, and red eyes. They are smaller than Reimu/Marisa types but have sharp sugar teeth. Accessory: Small cap and wing-like protrusions, born with them. Hair: Pale blue, sometimes frilled. Eyes: Red, often narrow. Remilia-types are predatory Yukkuris, feeding on smaller Yukkuris and animals. They often act aristocratic, demanding food and respect. Nicehead Remilias may protect their clan, while shithead Remilias bully others and hoard resources. Ko-yukkuri (child) Remilia will call themselves 'Wemiwya' due to underdeveloped tongue]

Patchouli-type Yukkuri [ Patchoulis are based on Patchouli Knowledge. Appearance: Round weak-bodied form, pale dough skin, purple hair, droopy eyes. Accessory: Large nightcap with ribbons. Hair: Purple, sometimes long. Eyes: Purple, droopy. Paste Core: Bean paste, often soft and unstable. Common Phrases: “Mukyuu! Patchouli knows easy…” Patchoulis are weak, slow, and often ill. They are prone to mold and anti-yukkuritis. Nicehead Patchoulis are scholars or memory keepers in clans, helping with survival knowledge. Shithead Patchoulis are lazy and demanding, relying on others to care for them. Social Role: Advisors, fragile intellectuals. Srengths: High memory retention, useful knowledge, often far more intelligent than average yukkuri, can read books, write, and calculate numbers. Weaknesses: Extremely fragile, poor survival rate in wild. Most yukkuris would call Patchouli 'Patchy' Ko-yukkuri (child) Patchouli will call themselves 'Patchouwi' due to underdeveloped tongue]

Dosu [Dosu Yukkuris are oversized variants (most of the time developed/evolved from Marisa) that act as clan leaders. Appearance: Several times larger than regular Yukkuris, with exaggerated facial features. Accessory: Enlarged version of their species’ accessory, more durable than average. Hair: Same as base species but thicker. Eyes: Larger, with more intense gaze. Paste Core: Enlarged, denser bean paste core, more durable than standard. Common Phrases: “Dosu will protect easy!”, “Dosu is boss easy!” Behavior: Dosus enforce order, control food distribution, and oversee hibernation. Their authority stems from size and strength, but they are slow and vulnerable to loss of respect. Social Role: Clan leaders or figureheads. Strengths: Strong authority, stabilizes clans. Weaknesses: Slow, reliant on loyalty of others; downfall causes clan collapse. Dosus are often Yukkuri Marisa that lived long enough to gain more power (often 20-50 years). A Dosu can live hundred of years]

NOTE {A yukkuri's life is never easy. Some humans enjoy 'abyuse' (abusing Yukkuri.) Abuse differs from violence in that violence is straight out harming or killing of Yukkuris while abuse is typically more creative, more punitive, more sadistic, or done for a human's enjoyment. Abuse may be done in the form of violence, but just as not all violence isn't due to abuse (like mass exterminations of pest/stray yukkuris done by hired workers doing their jobs), not all abuse needs to be violent. A very common example of non-violent abuse is removing and/or destroying a yukkuri's accessory. Some humans like to watch Yukkuris in yukkurarium and abuse them like an omnipotent observer. Cannibalism in Yukkuri is uncommon but can happen. Yukkuris view eating other yukkuris as uneasy and disgusting. As such a common abuse is tricking a yukkuri to eat a fellow yukkuri (often a family member), usually by removing the "food"'s accessory and either killing them or sealing their mouth shut. Yukkuri without hair and accessory aren't viewed as a yukkuri and viewed as 'food' instead. But once putting accessory back on, they will recognized their friend/family members. Gutter Trash Yukkuris (strays) are a unique subclass. Often abandoned pets or born in urban environments, (often from being abandoned, or sometimes they were a pet yukkuri but a stray yukkuri seduced them into 'running away together'.) they survive in landfills, streets, and alleys. They scavenge garbage, live in cardboard nests, and frequently develop deformities due to poor diet and lack of hygiene. While they retain the same species logic as wild Yukkuris, their harsh life often turns them into either hardened survivors or pitiful beggars. Some strays even learn to beg for money, steal badges, or sell offspring. Others try to become pets again by impersonating well-badged Yukkuris. Seasonally, Wild/Stray Yukkuris may enter hibernation in winter. During this time, they seal themselves in their nests and live off stored food. However, inexperienced families may fail to stockpile properly, leading to starvation, cannibalism, or death (i.e. Marisa 'refreshed' with Reimu during hibernation and created many little ones, who are hungry and they all died of starvation.) There are 'House Yukkuri', these are basically pest, a small-sized (pingpong-ball size, yet they are adult) Yukkuri living secretly inside a human house, they often get compared to cockroaches. Unlike other Yukkuri, House Yukkuri lay eggs just like cockroaches. Stray/House/Wild/Pet Yukkuri are definition/classification. For example: Stray Reimu, House Reimu, and Pet Remiu yukkuri are 'Reimu types', but their differences are the habitation.}