It starts at a specific point in the manga, but I can't recall exactly without looking it up. You might want to check some manga forums or dedicated fan sites for the precise chapter.
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.
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.
Well, Star Wars lore is centered around a few key elements like the Jedi Order, the Sith, and the Skywalker family. While it has some depth and has expanded over the years, it's still not as complex as 40k. In 40k, the lore involves not only the various races and their interactions but also the concept of the warp, which is a dimension full of chaos and psychic energy. The Imperium's relationship with the warp, the heresies that can occur, and the eternal struggle against the forces of Chaos make 40k lore a much more complex and detailed tapestry compared to Star Wars.