Chainsaw Man
Both are about young fighters joining a supernatural extermination organization and facing enemies born from human fear or negative emotion. Chainsaw Man is more vulgar and chaotic, but the cursed-monster battles and dark shounen energy are strongly shared.
Demon Slayer
Both deliver modern high-polish shounen combat with squads, mentors, special techniques, and monsters that still have tragic human roots. Demon Slayer is more emotionally earnest, while Jujutsu Kaisen is snarkier and more urban, but fans often recommend them together for action pacing and spectacle.
Bleach
Jujutsu Kaisen inherits a lot of the same appeal as Bleach: stylish spiritual combat, monster exorcism, cool mentors, and enemies with distinct abilities. Bleach is longer and more old-school, but fans of cursed energy battles often enjoy its Soul Reaper structure.
Naruto
Both build around a young protagonist carrying a dangerous inner power while training with a team under an iconic mentor. Naruto is more classic ninja shounen, but the team dynamic, rival energy, and big technique-based fights explain the community overlap.
Hunter x Hunter
Hunter x Hunter gets recommended because of its tactical power-system appeal. If someone likes Jujutsu Kaisen fights where rules, domains, restrictions, and matchups matter, Hunter x Hunter's Nen battles are one of the clearest next steps.