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.
Iori Yagami was a famous swordsman in the martial arts novel," The Eight Dragons ". His story told that he had traveled to a different world, where he learned different martial arts and became a top swordsman. He had experienced many challenges and adventures in his life and made many friends. He was willing to sacrifice himself to protect his country.
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.