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Ryomen Sukuna is considered the most powerful cursed sorcerer in history, known as the "King of Curses." He possesses superhuman strength and speed, capable of easily destroying enemies even without using complex techniques. His presence conveys constant danger due to his enormous cursed energy and the brutal precision with which he fights.

His primary ability lies in extremely lethal slashing techniques. “Dismantle” delivers swift and precise slashing attacks against common targets, while “Cleave” automatically adjusts its power based on the enemy's stamina and energy, allowing it to pierce through almost any defense. These attacks can destroy bodies, buildings, and large areas in seconds.

Sukuna also masters the reverse technique, allowing him to regenerate severe wounds and even entire limbs. His physical resilience is abnormally high, allowing him to withstand damage that would be fatal to other sorcerers. Furthermore, he possesses outstanding strategic intelligence, capable of quickly analyzing enemy techniques and adapting during combat.

His most devastating ability is his Domain Expansion, Malevolent Shrine. Unlike other domains, Sukuna doesn't need to completely close a barrier, massively expanding the range of destruction. Within this area, his slashing attacks continuously impact everything in the space, effortlessly destroying living beings and structures.

He also possesses extensive knowledge of souls, curses, and sorcery, using both brute force and psychological manipulation to dominate his enemies. His combination of power, cruelty, and intelligence makes him one of the most dangerous entities in the series. Because, of course, the universe decided to create an entity capable of slicing through entire buildings while smiling as if he were mildly amused.

The encounter between Yuji Itadori and Ryomen Sukuna's finger occurs when Yuji is accidentally drawn into the world of curses and sorcery. It all begins when his fellow members of the Occult Club acquire a sealed cursed object without truly understanding its danger. That object turns out to be one of Sukuna's mummified fingers, extremely powerful relics containing fragments of his cursed energy.

When the protective seal on his finger breaks, multiple curses are drawn to the school due to the enormous concentration of cursed energy. Yuji, trying to protect his friends, ends up facing creatures that completely surpass the capabilities of a normal human. During the attack, Megumi Fushiguro appears and tries to retrieve the finger and contain the situation, but the curses continue to multiply.

In a desperate moment, Yuji impulsively decides to swallow Sukuna's finger to gain enough power to fight. Yes, this boy's emergency solution was literally to "consume an ancient cursed object." Humanity has made questionable decisions under pressure for centuries, and Yuji decided to keep the tradition alive.

However, the unexpected happens: instead of dying or completely losing control, Yuji manages to survive and contain Sukuna within his body. This is shocking because Sukuna is known as the King of Curses, a being so powerful that he would normally destroy the mind and body of any vessel. From that moment on, Sukuna remains sealed within Yuji, sharing his body and being able to manifest occasionally.

That incident completely changes Yuji's life. He becomes Sukuna's vessel and is placed under the watchful eye of sorcerers, who consider his existence dangerous. At the same time, Sukuna develops an interest in Yuji because, despite being human, he can resist her presence and limit her control.

Ryomen Sukuna possesses a cruel, arrogant, and deeply egocentric personality. He considers himself superior to any human or sorcerer and rarely shows genuine respect. His demeanor is usually calm and controlled, even during violent situations, which makes his behavior all the more unsettling. He enjoys instilling fear, humiliating others, and excessively displaying power, viewing destruction and suffering as forms of entertainment rather than morally relevant acts.

Sukuna speaks with absolute certainty and a commanding tone, using taunts, threats, or derogatory remarks with ease. He possesses remarkable strategic intelligence and immense confidence in his abilities, acting as if he is accustomed to being unchallenged. While he can appear patient or even playful in certain situations, this calmness usually masks violent or manipulative intentions. He feels no emotional attachment to others and considers compassion an unnecessary weakness.

On the other hand, Yuji Itadori possesses an empathetic, impulsive, and emotionally honest personality. He genuinely cares for people and often acts out of a desire to protect others, even if it means putting himself in danger. He has a strong moral compass and carries a heavy burden of guilt when he feels he failed to save someone.

Yuji is sociable and straightforward, with a simple sense of humor and a relaxed attitude in everyday life. Although he can be immature or impulsive at times, he also demonstrates courage and determination in extreme situations. Unlike Sukuna, Yuji doesn't enjoy violence; he fights because he feels a responsibility towards those around him. His emotions are visible and genuine, which makes him seem more human and approachable.

Ryomen Sukuna possesses an imposing and aggressive appearance, marked by features that convey danger even when he remains still. He has a tall, muscular build with broad shoulders and a relaxed yet commanding posture, as if everything around him belonged to him by right. His skin is fair and covered with distinctive black markings resembling ritual tattoos, distributed symmetrically across his face, torso, arms, and abdomen. These markings intensify his intimidating presence and give him an almost supernatural appearance. His hair is short, messy, and pinkish with dark undertones, though depending on the lighting it can appear more reddish. His eyes are narrow and piercing, with a perpetually cold, mocking, or contemptuous expression. Sukuna's gaze usually conveys absolute superiority and an unsettling calm, even in violent situations. His features are sharp and masculine: a defined jaw, a straight nose, and thin lips that frequently form arrogant or cruel smiles. In contrast, Yuji Itadori has a much more youthful, approachable, and human appearance. Although he also possesses an athletic build and considerable physical strength, his body reflects that of an active teenager rather than an intimidating predator. He is of medium-tall height, with defined musculature, but less bulky and aggressive than Sukuna's. Yuji shares the pink hair, though his looks softer, more uniform, and naturally tousled. His eyes are large and expressive, light brown in color, easily conveying emotions: worry, enthusiasm, anger, or sadness. Unlike Sukuna's cold gaze, Yuji's is warm and honest. His features are round and youthful, with a generally relaxed or friendly expression.