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.
Repaying kindness with ingratitude was a modern novel about reincarnation. The main character was Ying Changge, the first emperor of Qin. The story was about Ying Changge transmigrating to Great Qin and becoming a nine-year-old prince. He was sent to the border by an imperial edict and guarded the border for life. He activated a nation protecting system and obtained god-level killing techniques, god-level military laws, the power of the Great Yellow Court, and the Snow Dragon Riders through the years of protecting the nation. During the 18 years he had been guarding the border, he had obtained countless achievements, killed millions of enemies, and defended the northern side of Great Qin. This novel had been completed and could be read on 36 Literature Network and other websites.