Sukuna is the main antagonist of Jujutsu Kaisen, the manga series by Gege Akutami that began in 2018 and was adapted into an anime in 2020. Voiced in Japanese by Junichi Suwabe, the character is known for his arrogant, amused way of speaking to weaker opponents. Short clips of his lines circulate widely on soundboards and in anime edits, and this repeated gambare line became popular as a reaction sound because it captures his mocking personality in just over a second, making it easy to reuse across memes.