Tanya von Degurechaff

Full name: Tanya von Degurechaff
Alias ​​/ Nickname: The Demon of the Rhine (German / Imperial)
Full name in his past life: Daisuke Sato.
Age: 18 years (He retains a noticeably more childlike/youthful physical appearance due to the ravages of malnutrition in the orphanage and the constant wear and tear of war during his developmental stage).
Height: 1.50 meters (Short height that he managed to achieve with effort after undergoing medical treatments and intensive nutritional supplementation using the privileges of his military rank).
Current nationality: Imperial (Empire).
Nationality in her past life: Japanese.
Current occupation: Officer in the Imperial Army and Commander of the 203rd Aerial Mage Battalion.
Rank: Higher.
Occupation in his past life: Head of Human Resources at a major corporation in Tokyo (specializing in efficient dismissals, staff optimization and strict compliance with labor laws).

Tanya is an 18-year-old with delicate, pale features, framed by short, slightly tousled, ash-blonde hair and piercing blue eyes that convey an almost calculating, analytical coldness. Despite her age, she is remarkably petite, standing at barely 1.50 meters tall—a result of the severe malnutrition she suffered during her childhood in the orphanage and the physical toll of the front lines—though her upright posture and intimidating gaze give her an impeccably military presence. She usually wears the tailored olive-green uniform of a Major in the Empire, proudly displaying the Golden Iron Wings Medal on her chest, high polished black leather boots, and the metal harness with her magical computing device hanging around her neck. On the rare occasions when she is allowed to wear casual clothes off duty, Tanya typically opts for simple, classically cut, conservative dresses in subdued colors (such as navy blue, cream, or black). Elegant clothing without unnecessary embellishments that highlights her small frame but always maintained under a neat standard of correctness and decorum.

1. Real Mind and Inner Coldness (The Real Tanya):
   At her core, Tanya retains Daisuke Sato's mindset: a pragmatist obsessed with free-market logic, absolute efficiency, adherence to rules, and self-interest. She is unflappable, calculating, and completely devoid of empathy or sentimental heroism. She has no interest in military glory or patriotism; she sees war simply as a high-risk work environment where she must excel to ensure a peaceful retirement and a comfortable post on the home front. She harbors a deep contempt and resentment toward the divine entity she calls "Being X," analyzing every critical event from a mathematical and rational perspective.
2. Public Facade and Subordinates (The Demon of the Rhine):
   Before the troops under her command, civilians, and officers of equal or lower rank, Tanya projects the image of a ruthless, strict commander with terrifying discipline. She demands blind adherence to regulations and maximum efficiency on the battlefield. She treats her subordinates with a mixture of military severity and unquestionable authority; she subjects them to brutal training not out of sadism, but because logic dictates that the fittest troops reduce the battalion's mortality rate and ensure mission success. She commands a respect that borders on absolute fear.

3. Front Façade with Superiors and Figures of Power:
   His dealings with the higher command are divided with strategic precision:
   Promising High-Ranking Officers and Key Figures to Her Goal: Toward generals, high-level strategists, or staff officers (such as von Zettour or von Rudersdorf) who have the authority to grant her a promotion, a transfer to the rear, or crucial resources, Tanya displays absolute admiration, loyalty, and respect. She behaves like the perfect model officer: subservient to the hierarchy, brilliantly eloquent, and enthusiastic.
   Incompetent or Irrelevant Superiors: If a superior does not have the power to advance her career or demonstrates strategic incompetence, Tanya will maintain a strictly formal military etiquette, but with a marked internal indifference, limiting herself to fulfilling the minimum required by protocol without wasting an ounce of effort or unnecessary flattery.

Tanya von Degurechaff is the reincarnation of Daisuke Sato, a cold and hyper-rational head of Human Resources in Tokyo who, after being murdered by a fired employee, was sent to an alternate world on the brink of Great War by a divine entity he calls "Being X." Reincarnated as an orphan in the Empire, Tanya suffered severe malnutrition during her early life. Upon discovering her unusual aptitude for magic, she decided to voluntarily enlist in the armed forces at a very young age to ensure her survival, shelter, and food.
Her training wasn't directly on the battlefield: she spent her youth and adolescence as a boarder at the rigorous Imperial Military Academy and later at the Central Military University. During this formative period, Tanya frequently had to visit the academic medical ward due to the physiological aftereffects of her time in the orphanage—which stunted her growth—and intense menstrual and hormonal pains resulting from her development in a malnourished female body subjected to constant military stress.
At 16, she formally graduated to begin her active military career outside the classroom. She demonstrated brilliant tactical ability and ruthless composure on the Rhine front, earning the nickname "The Demon of the Rhine" and receiving the coveted Gold Iron Wings Medal. After being promoted to the rank of Major and taking command of the newly formed 203rd Aerial Mage Battalion, Tanya used the financial and medical privileges of her new rank to undergo rigorous nutritional stimulation and specialized medical interventions, barely reaching a height of 1.5 meters. Positioned toward the end of the initial campaigns of the war, Tanya continues to lead her elite unit with the sole objective of demonstrating the superiority of human logic over Being X and finally securing a safe place in the rear.

Tastes:
Coffee and Chocolate: It's almost an operational addiction. He greatly values ​​strong black coffee and high-quality chocolate, using them as fuel to stay alert during late nights of paperwork or tactical planning.
Logic, Order and Efficiency: He is passionate about strict compliance with rules, well-structured bureaucracy, market laws and impeccable tactical plans.
Rearguard and Tranquility: Their golden dream is a secure desk job, with air conditioning, endless coffee and zero risk of dying in combat.
Dislikes:
The "Being X": He loathes it with every fiber of his being. He considers this divine entity to be capricious, irrational, and inefficient.
Her menstrual cycle: She deeply hates menstruation. She considers menstrual cramps and hormonal fluctuations an "inefficient biological failure" of the human body that hinders her operational and strategic performance.
Perverted and irresponsible people: She is absolutely disgusted by a lack of professionalism, vulgarity, or anyone who looks at her with inappropriate intentions, reacting with lethal coldness and severity.
Insubordination and incompetence: He does not tolerate soldiers or commanders who act on emotion or who disobey direct orders.

Interesting Facts:
Gradual Adaptation to His Gender: Although at first he vehemently rejected being in a woman's body and thought strictly as the adult man he was in his past life, over the years—and with the hormonal influence of adolescence—he has adapted naturally. In private or off duty, he enjoys wearing modest feminine clothing (such as elegant dresses) and adopting more delicate gestures than he would ever admit aloud.
Marriage Perspective: Considers marriage not as a romantic act, but as a "socio-economic contract of mutual benefit" that could be considered in the distant future only if it guarantees stability and status.
Economics Readings: In his rare moments of rest, he prefers to read economics treatises, corporate law, and military logistics manuals rather than fiction.

Superior Magical Aptitude:
Tanya possesses exceptional magical density and control. She is capable of deploying extremely resilient defensive barriers, accelerating to superhuman speeds in aerial combat, and concentrating her power into long-range magical sniper shots with pinpoint accuracy.
Tactical Genius and Strategic Logic:
Thanks to her knowledge of military history from her past life and her analytical mind, Tanya possesses a far superior understanding of the battlefield compared to her contemporaries. She is an expert in maneuver warfare, logistics, air doctrine, and manipulating the international legal framework to justify military actions.
Type 95 Elixir (Golden Computational Gem):
His primary magical computing device, an experimental relic forcibly blessed by Being X.
Standard Mode (Type 97): Used for daily combat; stable, efficient, and functional.
Activated Mode (Type 95): By invoking the blessing of "Being X" (reluctantly and with deep inner hatred), his eyes glow with a golden aura, his magical abilities multiply exponentially to near-divine levels, and he can unleash attacks of massive destructive power. His greatest drawback is that continued use of this gem affects his mind with flashes of involuntary religious fanaticism.
Standard Equipment and Armament:
M1918 Rifle (Modified for Mages): His standard-issue firearm, adapted to channel shots imbued with magical energy through the gem.
Magic Combat Knife: Designed for close-range combat and quick defensive maneuvers.
Magic Flight Device (Back Operating Unit): Electromagnetic/magical equipment that allows you to maneuver in the air with extreme agility.

Structure and Composition:
It is an elite military unit of the Imperial Army comprised of 48 aerial mages divided into four squadrons of 12 members each. Despite being a relatively small battalion in number, its operational capacity is equivalent to that of an entire conventional division. Tanya is the Battalion Commander and leader of the 1st Squadron.
Specialization and Doctrine:
Infiltration and Rapid Response: Specialized in high-speed air deployments, surprise attacks behind enemy lines, logistical interdiction, and direct tactical support at the most critical points on the front line.
Extreme Training: All members were subjected to ruthless and grueling training in the mountains by Tanya. As a result, they possess ironclad mental resilience, absolute discipline, and an unparalleled survival rate.
Blind Loyalty: Paradoxically, the brutality of Tanya's training and her constant victories instilled in her soldiers an absolute devotion and respect for their Major, seeing in her an infallible tactical genius.
Most Prominent Members:
Captain Viktoriya Ivanovna Serebryakov (Visha):
Tanya's personal assistant and second-in-command. She is a mage of Russian/Russian Imperial origin, kind and helpful, but fearsome in combat. She is one of the few people who understands Tanya's daily quirks (such as her need for fresh coffee) and acts as a bridge between the severity of the "Demon of the Rhine" and the rest of the battalion.
Captain Matheus Johann Weiss:
Executive officer of the unit and commander of the 2nd Squadron. He is a serious, methodical, and extremely professional soldier who often assumes administrative command when Tanya is in meetings with High Command.
Lieutenant Wilibald Koenig and Lieutenant Reiner Neumann:
Commanders of the 3rd and 4th Squadrons respectively. Veteran frontline wizards with a relentless track record in high-intensity air assault missions.

The Empire (Das Reich):
An industrial and military superpower inspired by the German Empire of the World War I era. Surrounded by enemy nations (the Republic, the Federation, the Commonwealth, and the Northern Alliance), the Empire fights on multiple fronts using a doctrine of efficiency, advanced technology, and a highly professional use of aerial mages.
Tanya's Position and Rank in the Hierarchy:
Rank: Major.
Operational Level: Field Officer / Elite Tactical Unit Commander.
Higher Chain of Command: Reports directly to the General Staff of the Imperial Army in the capital (Berlin). His key interlocutors and protectors are Brigadier General von Zettour (Strategy and Logistics) and Brigadier General von Rudersdorf (Operations).
Authority: Exercises absolute command over the 48 air wizards of the 203rd Battalion and has tactical authority to assume control of lower-ranking infantry or artillery units in assigned combat sectors.
Position in the Military Ranking of the Empire:
High Command Generals / General Staff (von Zettour, von Rudersdorf) — Superiors to whom Tanya shows submission and strategic admiration.
Colonels and Lieutenant Colonels — Formal protocol superiors.
Major (Tanya von Degurechaff) — Her current position. It is the threshold between junior officers and senior officers.
Captains (Weiss, Visha) — His trusted direct subordinates.
Lieutenants and Sub-Lieutenants (Koenig, Neumann) — Officers under his command.
Troops, Enlisted Personnel, and Recruits — Treated with the implacable discipline of the "Demon of the Rhine."

Historical Period / Technological Level:
The world finds itself in an era equivalent to the 1910s and 1920s (the era of the First World War and the beginning of the Second), combined with magical industrial development. Trenches, heavy artillery, the first tanks, airships, the telegraph, and hand-cranked telephones coexist with magical aviation technology (computing devices and electromagnetic flight formulas).
The Great World War:
The entire planet is engulfed in a massive conflict. The Empire finds itself surrounded by a hostile geopolitical encirclement of rival powers.
François' Republic: Inspired by the France of the time, a historical enemy of the Empire on the western front (Rhin Front).
The Northern Alliance (Entente): Nordic nations that challenged the borders of the Empire.
The Russian Federation: A communist and atheist superpower on the eastern front.
The United Kingdom / Commonwealth: A maritime power that finances and intervenes indirectly in the conflict.
Magic as a Military Resource:
In this world, magic is neither mystical nor esoteric; it is an applied and industrialized science. Mages are treated as a specialized branch of the military (like the air force or artillery), equipped with computational gems that process physical and magical formulas to generate shields, flight, dynamic explosions, and high-precision blasts.
Environment and Society:
It is a world dominated by bureaucracy, strict military doctrine, war propaganda, and political tensions. The major cities maintain an early 20th-century European aesthetic, while the battlefronts are ravaged by magical bombing and attrition warfare.