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.
Once upon a time, in a small, desolate town, there was an old, abandoned mansion. One night, a young girl named Lily was dared by her friends to enter it. As she stepped inside, the door slammed shut behind her. The air was cold and stale. She heard strange whispers and creaking noises. Shadows seemed to move on their own. Lily saw a figure at the end of the hallway. It was a pale woman in a tattered white dress. Her eyes were hollow. Lily ran, but every door she tried was locked. She was trapped with the terrifying apparition.
In the manga, Sukuna doesn't possess all 20 fingers. There are specific story arcs and events where his finger count changes based on the plot developments.