Sukuna Gojō emerged from a wealthy background marked by profound emotional neglect. A pivotal betrayal occurred when his parents disposed of a stray cat he had bonded with, replacing it with a pedigree cat without consideration for his feelings. His subsequent anger led to the pedigree cat's removal as well. Distrust of adults solidified upon discovering a friend was instructed by parents to befriend him while feigning humility about their relationship. This pattern of betrayal culminated in Sukuna running away during fifth grade. He survived independently on the streets using the Jungle application, anonymously issuing missions for points to evade pursuit and avoid guidance. His frequent collaborator during this period was the disguised U-rank player Douhan Hirasaka. Aiming for J-rank to meet the Green King, Sukuna and Douhan challenged Yukari Mishakuji. Yukari effortlessly overpowered them in their first encounter, leaving Sukuna unconscious. Douhan unexpectedly returned to rescue him, taking him to a safe house. Sukuna expressed surprise at discovering Douhan's gender but focused on strategy. When Douhan indicated she was quitting missions, Sukuna declared his intent to continue using Jungle. He later confronted Yukari again at an abandoned warehouse, expending Jungle points to acquire special abilities. Nagare Hisui observed remotely, expressing a desire to recruit him. Tenkei Iwafune intervened, issuing Douhan a private mission to save Sukuna during the duel. Douhan's interference allowed Sukuna to technically "win," attaining J-rank, though he collapsed in tears over the hollow victory. Meeting Nagare, Sukuna displayed immediate anger and distrust toward manipulative adults. Nagare explained his vision for a new world as his motivation. Questioned about his own dreams, Sukuna admitted lacking personal aspirations. Nagare invited him to witness and participate in realizing this vision as an enjoyable game. Sukuna accepted, stipulating he would disengage if the game proved unsatisfactory. This marked his official integration into the Jungle clan, where he developed a sibling-like rapport with Yukari Mishakuji and casual dynamics with members like Iwafune. Despite his informal attitude toward Nagare, Sukuna became deeply invested in Jungle's activities. Personality-wise, Sukuna exhibits a blend of antagonistic and childlike traits. He displays nastiness toward enemies, openly mocking adversaries like Saruhiko Fushimi and relishing confrontations. Conversely, with allies, he behaves as a typical 13-year-old—impatient when excluded from action, competitive over gaming scores, and quarreling playfully with Yukari. His fighting style leverages his small stature for dynamic, agile movements, often employing a scythe. Central to his character is a strong aversion to unearned points or victories; he values effort and difficulty in achieving goals. Within Jungle, Sukuna actively advanced Nagare's objectives. He created and distributed a video insulting HOMRA to provoke inter-clan conflict, deliberately destabilizing Shizume Town. He accompanied Yukari on missions, such as infiltrating the school island to eliminate Kuroh Yatogami and capture Neko. During this, he fought Fushimi and Misaki Yata, dismissing them as unworthy. He participated in the assault on Mihashira Tower, breaching walls to facilitate stealing the Dresden Slate. When Fushimi joined Jungle, Sukuna grew resentful over Fushimi cheating to surpass his high scores, leading to physical confrontations. After Fushimi's betrayal was exposed, Sukuna eagerly attempted execution but was thwarted by Yata's intervention. Sukuna pursued both, engaging in a battle that culminated in his defeat and fall through a collapsing floor. His fate remained ambiguous until the season's conclusion, with later implications of survival following Jungle's dissolution after Nagare's death and the Slate's destruction. In a spin-off context, Sukuna appeared alongside Nagare Hisui and Yukari Mishakuji as part of an idol production narrative exploring divergent views on idol personas and lifestyles across different entertainment offices; specific details regarding Sukuna's role or development in this scenario are not elaborated.