Sukuna does die in the manga. The way it happens is quite dramatic and ties in with many other elements of the story, adding depth and tension to the overall narrative.
No. Ryomen Sukuna is a fictional character from Japanese mythology and modern manga/anime. He doesn't have a basis in a true historical event or person.
Nope. Ryomen Sukuna has no basis in reality. It's a product of the creative minds of the writers and illustrators who designed a captivating fictional character for the enjoyment of the audience.
In the 'joho gets sick fanfiction', it could be that Joho's illness is a mysterious one. His family and friends are worried sick. They search for a cure everywhere and in the process, they discover some secrets about Joho's past that are related to his current condition.
The 'joho gets s7ck fanfiction' is quite mysterious. If we assume that 'joho' is a character, perhaps from a particular series or just a name created by the author. And's7ck' could be a made - up situation or event. It might be a story that delves into the character of Joho's reaction to this unknown situation. Maybe it's a story of struggle, growth or just a really odd and unique adventure that the author has envisioned for Joho, but we really need more information to be certain.