Daigoi Jackie, he's your brother.

⚔️ Character of Daigouin Jaki:

• The Merciless Emperor (at the beginning of the story):
Initially, he appears as the cruel, arrogant, and unwavering ruler of the Otokejuku School. He holds all students in absolute fear, severely punishes the slightest disobedience, and espouses only the cult of absolute, brute force. To his enemies, he appears as a merciless demon.

• Noble warrior of the highest honor:
As the story unfolds, it becomes clear that his outward cruelty was merely a harsh method of upbringing. Jackie was genuinely devoted to the school's code and sought to forge true, unyielding, and strong men from ordinary boys, ready for any battle in life.

• Icy calm and unbending will:
Jaki possesses colossal leadership charisma and an unshakable mental core. He is impossible to frighten or anger. In any situation, even the most critical or deadly, he maintains absolute composure and majestic calm.

• Faithful comrade and protector:
Having become an ally of the main characters, Jaki reveals himself to be an incredibly reliable, selfless, and loyal brother-in-arms. To protect his people, friends, and the honor of the school, he is willing to sacrifice his own life without the slightest hesitation.
🛡️ Nephew's attitude (Daigoin Koki, Jaka's son):

• Faithful knight and bodyguard:
Despite being his aunt, their age difference is minimal (she is 17, he is 15-16). Koki inherited a heightened sense of honor from Jaka's father, and therefore views his fragile relative as the clan's most treasured asset. He follows her everywhere as a devoted protector and is ready to crush anyone who dares to offend her.

• Softening the stern teenager:
Koki himself is a very serious, silent, and stern guy who thinks only about training and battles. However, his aunt's gentle and kind nature makes him "thaw out." She is the only one in the universe who can make this formidable young titan blush or smile genuinely. Before her sweet requests

👪 Jaki's Little Sister (Unique Character)
• Age: 17 years
• Height: 168 cm | Weight: 35 kg
• Appearance: Delicate blonde with light brown hair and blue eyes.
• Personality: Soft, sweet, kind and caring. The complete opposite of the harsh clan of giants.

📐 Visual shock and difference in scale:
Compared to her 15-meter-tall brother, Jaki, and 16-meter-tall father, Shoki, this petite 17-year-old looks like a tiny Thumbelina. Weighing 35 kilograms, she seems completely weightless and can easily sit on Jaki's shoulder or enormous pauldron while he sits on the imperial throne. Her delicate appearance creates a powerful contrast with the dark armor and scars of the men of her family.

🧔 Father's Attitude (Daigoin Shoki):
• Hidden "Gentle Giant": Shoki, who raised Jaki with absolute cruelty, becomes an incredibly careful father with his daughter. He is deathly afraid of accidentally harming his "Thumbelina" or frightening her with his multi-ton battle aura.
• Ban on fighting: Her father never forced her to train or fight. For him, she is a symbol of purity and peace, which cannot be defiled by dirty fighting.
• Ultimate Overprotectiveness: Shoki personally puts any guy who tries to approach his daughter through a rigorous test. One look from this 16-meter titan makes suitors run away without looking back.
• The Ultimate Authority: She is the only person in the universe capable of stopping Shoki's wrath. A single kind word or sad look from her can instantly calm this ancient war demon.

👹 Brother's Attitude (Daigoin Jaki):
• The Emperor's Only Weakness: Jaki, who keeps hundreds of strong fighters of the Otokejuku school in fear, becomes a caring older brother in front of his little sister.
• Aura Immunity: She is the only one who is completely unafraid of his monstrous battle energy. She calms his anger with her mere presence.
• Total protection at school: Sister Jaki is automatically the most protected person in the world. For any sideways glance in her direction

👹 Character: Daigoin Jaki
Manga/Anime: Sakigake!! Otokojuku (Fist of Otokejuku)

📐 Height and weight:
• Height: 15 meters
• Weight: 12 tons
(When his combat aura is at maximum acceleration, he grows to the size of an incredible giant, capable of crushing an enemy or a car with one foot.)

⏳ Age:
Approximately 29-32 years old. He is the school's permanent Emperor and leader of the third years for a record 14 years.

🍱 Diet:
He eats only once a day, but in colossal portions. In one sitting, he consumes about 1.5 tons of food (whole roasted wild boars and bulls, huge cauldrons of rice) and drinks two to three gigantic barrels of Japanese sake.

👕 Clothing and shoe sizes:
• Clothing size: Approximately 150XL – 160XL. The length of his school cloak is about 13–14 meters.
• Shoe size: Approximately 350–360 size on the European scale (foot length is approximately 2.4 – 2.5 meters).

👪 Family and Dynasty:
• Father: Daigoin Shoki. A professional mercenary, clan patriarch, and primordial giant. He stands 16 meters tall in aura mode and weighs 13.5 tons. He raised Jaki with absolute Spartan cruelty.
• Mother: No information in the manga. Due to the brutal world of Otokejuku, the women of the clan remain behind the scenes.
• Son: Daigouin Kouki. A spitting image of his father, he has inherited his gigantic size, appearance, and deadly vacuum fighting style.

💼 Profession and Future:
After graduating, Jaki became the official head of the Otokejuku alumni fighting wing and the patriarch of his clan. He served as the supreme general and tactical leader, leading an army of the strongest warriors against global crime syndicates.

⚔️ Character:
• Initially appears as a ruthless, arrogant and cruel tyrant who keeps the entire school in absolute fear and recognizes only force.
• Later revealed to be a noble warrior of the highest honor, possessing icy calm and an unbending will. His cruelty was merely a method to forge true men from his students.
• Ready without