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.
Sikandar (Alexander the Great) and Porus were two great warriors. When Alexander invaded India, he faced Porus. Porus was a king in the Punjab region. Their battle was fierce. Porus fought bravely with his elephants and army against Alexander's well - trained Macedonian troops. In the end, though Porus was defeated, Alexander was so impressed by his courage that he allowed Porus to continue ruling his kingdom under his suzerainty.