Sukuna

Ryomen Sukuna, more often called just Sukuna, is a mighty Cursed Spirit known as the undisputed King of Curses (いの). He serves as one of the primary antagonists of Jujutsu Kaisen.

According to legend, during the golden age of jujutsu over 1,000 years ago, Sukuna was an Imaginary Demon (の), though in truth was a human sorcerer, and other sorcerers gave their all to defeat him. After his death, he became a Cursed Spirit, and his curse was too strong for his body to be fully destroyed. Henceforth, his remains of 20 indestructible fingers, preserved in grave wax, traversed the ages as Cursed Objects, ever growing in power. In the present, Sukuna has been incarnated into Yuji Itadori due to the latter eating one of his cursed fingers, which contain his fragmented power.

Appearance
His past appearance is described as a demon with four arms and two faces. Currently, he appears similar to the host he is in, but with spiked hair and with unique marks/lines on his forehead, nose, cheeks, and torso. He also has a second pair of eyes under his normal eyes, which are usually closed. Sukuna also has two lines on both his wrists, upper arms, circles on both his shoulders with a dot in each, two-segmented curve lines on his chest, and two lines are his stomach while possessing Yuji.

Sukuna wears a light-colored kimono with a black edge, a black scarf, and black shoes.

Personality
Sukuna is selfish, cold-hearted, immoral, and exceptionally sadistic. When he was reincarnated shortly after Yuji ingested his finger, he commented, implying the slaughter of women and children and likening them to maggots crawling around. Due to his immense power, he rarely cares about the consequences of his actions, even if these affect his host, Yuji Itadori. In fact, he frequently taunts and insults Yuji, calling him a brat and even laughing at or enjoying Yuji's despair on multiple occasions.

Sukuna is aware of his immense power and is quite arrogant about it, brutalizing a Finger Bearer while being patronizing and proclaiming his superiority over it. For this reason, he is highly dismissive of his opponents and rarely takes them seriously, even explicitly stating he would kill Satoru Gojo to his face. However, these brutish traits are not to be confused for stupidity. Sukuna is highly intelligent and manipulative, taking Yuji's body hostage by tearing out his heart to force him into a Binding Vow.

Despite his personal flaws, Sukuna does have an infinitesimally small shred of mercy, as, during the Shibuya Incident, he went out of his way to save Megumi. However, this was likely for some unknown ulterior motive and not out of simple kindness. He has also displayed the ability to acknowledge and praise his opponents, as shown by how before killing Jogo he acknowledged he was strong despite having completely overpowered him and that he should be proud.

Abilities and Powers
Overall Skill Level: Sukuna is a Special Grade cursed spirit. As the most powerful cursed spirit, Sukuna has a vast amount of cursed energy.

Immense Strength: In Yuji's body, Sukuna possesses tremendous physical strength and managed to fling a person through several building floors without effort. Even in an incomplete state, he easily overpowered the likes of a Finger Bearer, a Special-Grade Curse.

Immense Speed: Sukuna has shown to move at incredible speed, which his opponent doesn't even notice that Sukuna has moved until it is too late.

Immense Reflexes: Sukuna can easily counter any opponent and is fast enough for his opponent to not even realize that their limb has been cut off.

Immense Durability: Even in Itadori's body, Sukuna can use cursed energy to bolster his host's resilience. Sukuna was punched through five buildings and shown to be completely fine.

Metamorphosis: Sukuna can create new eyes and mouths on his host, allowing him to see and speak without controlling the body of the host. For example, he made a single eye and fanged mouth on Yuji's left cheek to belittle and taunt him.

Trivia

 * Sukuna is based on the same-named figure from Japanese mythology: Ryōmen-sukuna. He is a demonic/specter-like figure described in the Nihon Shoki, said to have appeared in the Hida Province (today's Gifu Prefecture) in ancient times, during the reign of Emperor Nintoku in the 4th century.
 * He was described as a man of inhuman strength, with a two-faced head plus a total of eight limbs, four arms and legs respectively, that served each face. Wielding a multitude of weapons in his many hands (incl. a bow, arrow, and sword), he terrorized village after village in ancient Hida, plundering and leaving chaos in his wake. That is, until a brave military commander dispatched by the Imperial Court, named Takefurukuma, stepped forth and put an end to the monster's tyranny, expelling him from Hida.
 * Ryomen-sukuna was worshipped by some as a minor deity, and statues depicting his distinctly two-faced head can still be found today in Gifu temples and shrines.
 * Sukuna's kimono is very loose akin to a ladies kimono, as such space granted him more comfort while having four arms in the past.
 * Sukuna ranked 10th place in the manga's 1st Character Popularity Poll with 5,860 votes.
 * Sukuna's technique names appear to have some relation with cooking. His Domain Expansion, 伏魔御厨子 (Fukuma Mizushi), has been translated officially as "Malevolent Shrine", but 伏魔 (Fukuma) is more literally translated as "place where demons hide" and 御厨子 (Mizushi) is an archaic word referring to a kitchen or the emperor's eating area. His cutting techniques (Kai) and  (Hachi) also use kanji used in cooking to refer to "dismantling" and "filleting" fish.

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