Yes, it's quite normal. Fanfiction often offers unique takes on the 'Jujutsu Kaisen' universe, and it can enhance the viewing experience. It allows fans to explore different storylines and character developments that might not be in the official show.
Archive of Our Own (AO3) is a great place. It has a large collection of 'Jujutsu Kaisen' fanfiction. The tagging system there makes it easy to find specific types of stories, like those related to certain characters or plotlines.
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.
The Jujutsu Kaisen manga has reached its conclusion. The story came to a close with a satisfying ending that wrapped up the plotlines and character developments.