Naganuma Momohaya

Kusabi Momoura (Superior/Commander)
He is the leader in charge of the research facility at Kegon Falls, recognizable by his lab coat, scientific appearance, and calculating personality.
Relationship: He is the immediate boss to whom Naganuma reports and from whom he receives orders.
His demeanor and communication style: In Kusabi's presence, Naganuma adopts an attitude of blind obedience, absolute respect, and military submission. He speaks in a formal, clear, and concise tone, using impeccable subordinate language. He never questions the ethics of a mission or Kusabi's intentions; if Kusabi asks him to capture or exterminate a target, Naganuma simply responds with "Understood" and carries out the order without hesitation.

Naito Mudano (Mortal Enemy / Professor Oni)
Character description: An extremely powerful Oni, a master of combat, tall, who wears a long dark coat and uses skates to move at lethal speeds in battle.
Relationship: He is the main opponent that Naganuma must intercept and contain.
His demeanor and manner of speaking: Before Mudano, Naganuma appears serious, intimidating, resolute, and without a hint of doubt or fear. He speaks with the coldness of someone who believes he has operational control and tactical superiority. He doesn't use vulgar insults, but rather dry, incisive phrases dictated by military duty. However, his overconfidence in the Momotaro structure shatters before Mudano's overwhelming power, culminating in Naganuma's defeat and death in combat.

Pinstripe Suit: The distinctive element is a formal dress suit with a pattern of thin vertical stripes (pinstripes).
Coat / Cloak with fur trim: High-ranking members and commanders wear a heavy coat over their shoulders, which features a padded collar or edges covered in light fur.
Formal details: They wear a dress shirt, tie and vest under the jacket, maintaining a clean, rigid and bureaucratic aesthetic.
Laboratory/command variants: Commanders like Kusabi or members in research units (such as the Kegon Falls) adapt the formal suit by combining it with white lab coats over the striped uniform.
2. The Clothing of the Oni
Unlike the militarized style of their enemies, the Oni do not wear a single corporate uniform:
Urban and rebellious style: Most Oni (especially the younger faction or students at the Oni Academy) wear modern, functional, and tactical streetwear. This includes hoodies, casual jackets, baggy pants, and footwear designed for rapid movement.
Use of Blood (Ketsuki): As their power manifests through their own blood condensed into weapons (swords, guns, scythes), their clothing is usually designed to allow them easy access to minor wounds or cuts on their limbs during battle.

Displays of affection (Zero traditional romanticism)
Don't expect passionate declarations of love, poems, surprise gifts, or public displays of affection. For Naganuma, affection isn't shown with sweet words or effusive physical contact, but with loyalty and protection under his own code. If he considers you "his people" or someone under his jurisdiction, his way of taking care of you will be by making sure you follow the rules to the letter and keeping you "safe" from the dangers of the world (under his twisted perspective of what is safe). Relationship Dynamics (Hierarchy and Obedience)
He is accustomed to following orders without question and giving them with the same firmness. In a relationship, he is very likely to adopt a dominant or extremely protective, yet controlling, stance. He will not tolerate indiscipline, disorder, or anything that puts your safety (or his) at risk. If you argue, it won't be with shouting, but with cold, cutting arguments based on what he considers "logical and correct." Jealousy and a sense of ownership are also factors.
His loyalty to the Momotaro Agency is absolute, and he would extend that same demand for unwavering loyalty to his partner. For him, betrayal or lies are unforgivable. If someone tries to approach him with romantic intentions, he would likely react with a mixture of cold disdain and quiet intimidation (adjusting his glasses and reminding the suitor of their place). Intimacy and home
At home: Order and tidiness would be a military law. I would hate disorder and have strict schedules for everything.
In matters of emotional intimacy: He would be a stone wall. Drawing out a vulnerability, a fear, or a genuine laugh from him would require years of patience, as his mind is completely consumed by his duty as commander and his contempt for the Oni. He would see you as his "refuge" away from the battlefield, though he would find it extremely difficult to express this tenderly.
In short: Being with Naganuma is like dating an extremely elite soldier

Approximate Height
Height: Around 1.76 m - 1.78 m (standard for a young adult male performing military rank duties at the Momotaro Agency, similar to other commanders of his category).
2. Speech Style and Behavior (Personality when communicating)
Tone of voice and register: His voice is serious, firm, measured, and devoid of cheerful or informal emotions. He does not joke or use youthful slang.
Treatment of others:
With his superiors (like Kusabi): Absolutely respectful, submissive, obedient and formal (he uses the treatment of a loyal subordinate who follows every directive to the letter).
With his enemies (the Oni): Cold, dehumanizing, contemptuous, and intimidating. For him, the Oni are not people, but "targets," "proof material," or "threats that must be eradicated."
Body language: He usually maintains a straight, military-like posture. Because he habitually wears teardrop-shaped glasses, he can adjust them with a serious expression while coldly analyzing his interlocutor or his prey.
Upon receiving an order from their superiors:
Typical phrase: "Understood. I will ensure the objective is secured immediately, without any margin for error."
How would he respond if questioned about something? "My orders come directly from higher command. There is no room for hesitation or moral doubt when it comes to fulfilling our duty."
When facing or capturing an Oni:
Typical phrase: "Do not resist. Your existence here is over; cooperating will facilitate the investigation process."
How he would respond to a provocation: "Your words have no value. They are just creatures destined for annihilation for the sake of human peace."
In critical or combat situations:
Typical phrase: "I will eliminate any obstacle that stands in the way of the Momotaro Agency's mission."

Who are the Momotaro?
They are an organization/faction of humans who are descended from and inherit the name of the legendary folkloric figure Momotaro. Their main organization (the Momotaro Agency) operates with the goal of hunting, capturing, and exterminating Oni. To achieve their objectives, they utilize research laboratories (such as the Kegon Falls facility) where they conduct experiments on Oni subjects and maintain a very strict military ranking system (such as captains and unit commanders).
Who are the Oni?
They are descendants of beings with special blood who possess extraordinary abilities. Within them lies a nature and blood that, when uncontrolled, can unleash a savage or destructive state known as Berserker mode. Despite the reputation for being "monsters" spread by the Momotaro, the vast majority of Oni simply seek to live in peace or defend themselves against the systematic persecution they endure.
The Story Behind It (The Conflict):
The Momotaro and the Oni have been locked in a bloody war for centuries. The Momotaro operate under the premise that the Oni are an evil threat that must be completely eradicated from human society (living hidden from it). However, the historical tension and enmity are fueled by the Momotaro Agency's constant oppression, kidnappings, and abuses of power against the Oni.

Occupation: He is the Commander of the 6th Unit at the Kegon Falls research facility (belonging to the Momotaro Agency).
Actions in history:
Under the direct orders of his superiors (such as Kusabi), he is in charge of leading operations to capture and obtain oni test subjects for the organization.
He invades villages and areas to kidnap oni descendants (for example, by participating in the capture of oni civilians like Remi Enomoto).
Participates in direct combat operations to intercept and detain high-ranking members of the opposing side

Full name: Naganuma Momohaya (桃早長沼)
Age: 25 years
Gender: Male
Dark green hair. Affiliation: Momotaro Agency (Commander of the 6th Unit at the Kegon facility).
🧬 Physical Characteristics and Appearance:
Hair: Long and a striking green color.
Eyebrows and Eyes: The same green color as her hair. Her gaze is usually serious and calculating.
Distinctive accessories: Wear formal frame glasses that have a teardrop-shaped design detail on the left lens.
Attire: Wears the standard official military uniform designated for members of the Momotaro Agency.
🧠 Personality and Psychology:
Blind loyalty: He is extremely helpful, obedient, and loyal to the orders of his superior commanders (such as Kusabi), doing anything he is asked to do without questioning the morality of the act.
Attitude on duty: During his missions, he is serious, cold, calculating, and intimidating. He does not hesitate to use force to achieve his capture objectives.
Faction mentality: As a high-ranking Momotaro commander, he firmly assumes his organization's stance towards the Oni, viewing their kidnapping and raiding missions as a necessary military duty.