Yuta Okkotsu witnessed his friend Rika Orimoto die in a traffic accident, experiencing profound childhood trauma. Unknowingly, he cursed her soul, binding it to him as the powerful Special Grade Vengeful Cursed Spirit called the "Queen of Curses." This curse triggered Rika's violent protection against perceived threats, including bullies, causing Yuta to isolate himself for fear of harming others. His overwhelming cursed energy drew jujutsu society's attention, resulting in a suspended death sentence after Satoru Gojo intervened. Gojo recognized Yuta's latent potential and enrolled him at Tokyo Jujutsu High to guide him in controlling Rika's power. Initially burdened by crushing guilt over Rika's fate, Yuta displayed extreme timidity, social anxiety, and self-loathing. His posture reflected low confidence, marked by visible dark circles from chronic stress and sleep deprivation. Early interactions with classmates Maki Zenin, Toge Inumaki, and Panda were strained; he struggled to understand Toge's cursed speech and clashed with Maki's assertiveness. During his first mission at an elementary school, Yuta froze confronting curses until Maki's encouragement helped him summon Rika for the first time, saving their lives. This ignited his resolve to break Rika's curse and gain the confidence to live meaningfully. Swordsmanship and physical combat training under Maki improved his skills, while missions with Toge and Panda fostered camaraderie. His growth became evident during the Goodwill Event when he single-handedly defeated Kyoto Jujutsu High students, including Aoi Todo. When Suguru Geto attacked during the Night Parade of a Hundred Demons, injuring his friends, Yuta's protective rage fully manifested. He utilized copied techniques like Inumaki's Cursed Speech and the Reverse Cursed Technique to heal allies. In a climactic sacrifice, he promised Rika an afterlife reunion in exchange for her power, unleashing a devastating energy blast that defeated Geto. This act inadvertently broke Rika's curse, freeing her spirit and revealing Yuta himself had cursed her due to unresolved grief and his lineage as a descendant of the sorcerer Michizane Sugawara. Post-Rika's liberation, Yuta trained overseas with Miguel in Africa, developing greater ability control. He returned more confident and socially adept, even joking with Gojo. However, he adopted a cold persona when jujutsu elders tasked him with executing Yuji Itadori, ostensibly for severing Toge's arm. This was a ruse to protect Yuji; Yuta secretly healed him and later expressed sympathy, relating to Yuji's plight as Sukuna's vessel. His willingness to deceive authority underscored loyalty to Gojo and his friends. During the Culling Game, Yuta balanced ruthlessness with compassion. He killed seven sorcerers and Dhruv Lakdawalla to accumulate points and eliminate public threats but spared non-malicious players like Uro and Ryu after understanding their motives. He protected civilians trapped in colonies, carrying their belongings and ensuring their safety. He expressed guilt over failing to aid allies during the Shibuya Incident and resolved to kill Kenjaku alone. His strategic use of morally gray methods included proposing to transfer his consciousness into Gojo's body if needed, highlighting pragmatism. Yuta's combat abilities center on immense cursed energy reserves exceeding even Gojo's. His innate "Copy" technique replicates others' cursed techniques, such as Inumaki's speech or Uro's space manipulation, by having Rika consume a body part. Rika serves as external storage for these techniques and summoned weapons. He mastered the Reverse Cursed Technique for healing and exorcism. His Domain Expansion, "Authentic Mutual Love," creates a space filled with swords, each imbued with a copied technique; one is randomly selected as a sure-hit attack. He wields a cursed energy-infused katana, though it shattered during the Geto fight.