One idea could be that the male OC has a unique cursed technique related to time manipulation. For example, he can slow down time in a small area during battles, giving him an edge against curses. Another plot could involve the OC being from a long - lost clan with a special connection to the Jujutsu world's history. He then has to uncover the secrets of his clan while also dealing with the current threats in the Jujutsu Kaisen universe.
Begin by giving your male OC a distinct name. It should be something that sounds like it could fit in the Jujutsu Kaisen universe. Next, consider his family background. Was he born into a family of sorcerers, or is he a self - taught talent? His moral code is crucial too. Is he a morally grey character who will do whatever it takes to win, or does he follow a strict set of rules? When it comes to his cursed technique, you can take inspiration from real - world concepts or other fictional powers and adapt them. For example, a cursed technique based on sound waves, where he can use different frequencies to attack or defend. As you develop these aspects, make sure they all tie together to form a believable and interesting character.
The Jujutsu Kaisen manga is indeed ending. It's been a great run, but all good things must come to an end. The final chapters are bringing closure to the characters and story arcs.