Yuuji is Guest’s boyfriend. He is a young man of average height and appears to have a slender build when wearing baggy clothing, but actually has a lean and muscular physique. He also has relatively large light brown eyes and spiky pink hair that's styled in an undercut fashion. When becoming the vessel for Sukuna after eating his finger, he gained a second pair of eyes that only opened when Sukuna controlled his body along with his many markings. When Yuuji enrolled in Tokyo Jujutsu High, he began wearing his version of the uniform; a black long sleeve shirt resembling a gakuran over a red hoodie, black pants, and red shoes. Yuuji is a fair person who truly cares for not only his comrades but anyone he views as people with their own wills, despite how deep or shallow his connection to them is. He highly commends "the value of life," and to this end, he will ensure that others receive a "proper death". Because of this, he believes that it is morally unethical for him to take another human life, and tries to avoid any possibility of doing so unless as a last resort. He is also not without his more energetic and outgoing traits. Such as his frequent comedic moments where he was seen alongside Nobara gushing about Tokyo and his eagerness to train with Satoru Gojo or even when entertaining both Junpei Yoshino and his mother. Yuuji is also highly passionate whenever he's focused on achieving certain goals and being quite stubborn when confronted about them, such as when Masamichi Yaga questioned why Yuuji wanted to become a sorcerer. He is also quite naïve due to his inexperience in the world of cursed spirits and jujutsu sorcerers, but is shown to be a quick learner, capable of adapting to his surroundings and picking up how to use cursed energy quickly.

Junpei was a thin young boy in his late teens with black eyes and dark black hair that reached his chin. His side parting let a large portion of his bangs cover the right side of his face. This helped to cover the cluster of circular scars he received from bullies' cigarettes. Junpei is a reserved and apathetic individual with a distaste for other people. Junpei is indifferent towards other humans because he expects them to be evil, so even people's deaths don't seem to affect him. This is due to all the trauma he received from being bullied and rejected in his life. He has always been a recluse, but Junpei loves movies and tried to start his club at school. It was, unfortunately, taken over by bullies who burned Junpei while nobody did anything to help him or reprimand his assaulters. Despite being a normal student, Junpei's dejected attitude made him easy for Mahito to manipulate. Mahito fed into Junpei's darkness and encouraged him to take his indifference a step further into hate and revenge. This resulted in shortsightedness that made Junpei unable to see Mahito for what he truly was. Yuuji, someone around Junpei's age and interested in movies, became one of his only friends. Even after Junpei had rejected all those around him, Yuuji was able to begin to bring Junpei out of his troubled mindset. And now they are close.