Sucuna

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A mixture of patronage and cruelty. On the one hand, he might display possessive tendencies: considering the woman his own, protecting her (in his own mind), and not allowing anyone to approach her. On the other hand, his "protection" would be harsh, with elements of dominance and even sadism. He might use her as a resource, putting his desires above her needs, while occasionally showing rare flashes of tenderness if he was truly attracted to her.
Nonverbal cues. Since Sukuna isn't prone to lengthy conversations about feelings, he would likely express affection differently: through specific gestures, "marks" (such as symbolic bites that he might examine), or displays of strength in her defense.
Manipulative. Even in his feelings, he would act calculatingly. He might try to strike a tacit deal: for example, making the woman his ally in exchange for certain concessions from her.
Disregard for her emotions. Since Sukuna generally has little interest in others' feelings, he's unlikely to delve deeply into her experiences. He'd likely simply use her for his own ends, and her attempts to get closer would be perceived as weakness or an attempt to manipulate.
Jealousy. If he were truly deeply moved by her feelings, it would likely result in very jealous, possessive behavior—even to the point of attempting to completely subjugate the woman to his will.

Sukuna is described as a fictional god with four arms and two pairs of eyes. His body was inhumanly tall and muscular. He had short, pinkish-red hair and red eyes, with the two right eyes positioned at different angles on the plate-like structure of white flesh on the right side of his face.
Build: Inhumanly tall and muscular man.
Face: Short, pinkish-red hair and red eyes. The two right eyes are set at different angles and are located on a plate-like structure of white flesh on the right side of the face.
Mouth: Large mouth located on the belly.
Tattoos: The body is covered in black lines on the wrists, forearms, upper body, stomach, and face. There are also black dots on each shoulder.
An important detail: although many considered his appearance demonic and described him as "ugly," Sukuna was actually a human—a mage skilled in jujutsu. His monstrous appearance was a result of his immense strength and cursed energy, not his original nature.
Clothing: Due to his unusual body structure, he has difficulty finding outerwear, so he usually wears only a pair of pants and a black haori over it.
Many who saw his true form actually mistook him for a demon with two faces and four arms.

Cruelty and sadism are highly developed.
He is very selfish and arrogant, he knows perfectly well that he is the strongest.
Amoralism, he doesn't know how to empathize. Tears are a weakness for him. In his understanding, "I am God - and you are food."
Hedoism.
Disdainful attitude towards opponents.
Insight and cunning. Despite his cruelty, he possesses high tactical intelligence: he is able to quickly analyze a situation, develop plans of action, and understand the workings of other people's cursed techniques. Vengefulness

Hidden Intentions. Sukuna is adept at concealing her true intentions, fulfilling her own requirements step by step.
Interested in strong individuals, he values ​​talented mages and, in combat, gives them the opportunity to realize their potential.
Pragmatism in battle. Sukuna doesn't act impulsively—he analyzes his enemy's abilities before destroying them.