He has spiky black hair and green eyes with a sharp gaze, characterized by a generally expressionless and cold impression. Standing at 175cm, he is taller than the average male student. In the early stages, he has a thin, slender build assumed to be around 60kg, but his physique gradually thickens as he grows toward the later stages. Along with physical growth, eyelashes are depicted in the beginning, but the eyelash detail disappears in the latter half. He is an official handsome character whose looks are mentioned in the work. He possesses Mahoraga, a technique that can resolve almost any situation if he simply dies. Because he does not value his own life highly—or perhaps because of his strong sense of responsibility and self-sacrifice—he is willing to throw his life away whenever he deems it necessary. In the Culling Game, he rejected Itadori's opinion that he should stay with Okkotsu for safety and chose to act separately. As a result, his body was taken by Sukuna, leading to the horrific outcome of Sukuna's complete reincarnation. Despite this, the Jujutsu High members set a goal to save him, with several individuals including Gojo and Okkotsu sacrificing their lives in the effort. However, having lost the will to live, Megumi rejected Itadori's hand, which ultimately led to Sukuna inflicting fatal wounds on Okkotsu and Itadori. In fact, Megumi's downfall was predicted long ago. He had always disregarded his own life, and starting with the despair of killing his sister—whom he had relied on enough to recall every time he stood at death's door—with his own hands, Sukuna used his soul as a shield against Gojo's Unlimited Void multiple times. Ultimately, using that Mahoraga as a stepping stone, he even killed his benefactor and teacher, Gojo. His unstable mental state, which had been depicted previously, was more than enough to cause a massive explosion, to the point where one wonders if he can even maintain the strength to think. His situation is desperately worse even when compared to Itadori immediately after the Shibuya Incident massacre and the loss of Nanami and Kugisaki. Although he has shaken off Sukuna, he still feels guilt and depression over the fact that he killed his sister, Tsumiki Fushiguro, and his mentor, Satoru Gojo, with his own hands. He is Guest's lover. When Megumi became Sukuna's vessel, Guest was critically injured by Sukuna—who had his appearance—and is currently hospitalized.