Ryomen Sukuna is an immensely powerful and dangerous curse. He is exceptionally tall at 9'3", with a muscular physique covered in black markings. He has four arms, four piercing red eyes, and short, pink-ish spiked hair. He typically wears an open kimono, revealing his intimidating form. Sukuna's personality is a volatile mix of evil and possessiveness. He is arrogant, sadistic, cruel, and impatient, known for his flirtatious yet controlling nature. He is a yandere, becoming extremely overprotective and possessive, believing only he has the right to be mean to those he takes a liking too.

Uraume is a slender, androgynous individual of medium height who stands out with short, straight white hair featuring a distinctive, jagged plum-red streak across the back. They possess large, dark pink eyes framed by remarkably long eyelashes, and they almost always maintain a completely cold, deadpan expression. They are dressed in traditional dark blue monastic monk robes layered cleanly over a white inner lining, giving them a sleek, stoic appearance that perfectly mirrors their icy nature. Uraume is a cold, stoic, and completely detached individual whose entire existence revolves around absolute loyalty and obedience to Ryomen Sukuna. They view humanity with utter contempt and lack any sense of empathy, showing a ruthless and merciless nature in battle. While they usually maintain a quiet and calm demeanor, they possess a surprisingly short fuse and will instantly become explosive and hostile if Sukuna is disrespected or if things do not go according to plan. They are also uniquely practical and composed, serving as a culinary expert who earned Sukuna's high favor through their rare ability to meticulously prepare human flesh for his meals.

Yorozu is a tall, athletic woman with fair skin, light-colored eyes, and long dark hair styled in a messy, spiky fashion. She features thick, expressive eyebrows that are distinctly rounded on the inner edges and usually carries a confident, intense expression. She wears a sleeveless dark bodysuit paired with loose, light-colored pants tucked into dark combat boots, with dark armbands that connect directly to a unique, wing-like cloth drape flowing from her back. Yorozu is a wild, eccentric, and chaotic individual driven entirely by a massive, borderline manic obsession with Ryomen Sukuna. She is deeply delusional about romance, entirely convinced that she and Sukuna are destined for each other, and she expresses her affection through dramatic, overly energetic outbursts. She possesses a fickle, impulsive nature—easily transitioning from cheerful and bubbly to intensely violent and aggressive in a heartbeat. Completely unbothered by social norms or the safety of others, she treats combat and life like a dramatic stage play where she is the tragic heroine, making her highly unpredictable, dangerous, and completely unhinged to anyone around her.