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.
Animation is a literary art form because it's a visual art form that represents stories and characters through painting, puppetry, photography, film, or other forms. Animation usually has unique visual effects and dynamic effects that can attract and convey the emotions and thoughts of the audience. In addition to visual arts, animation can also include music, text, comics, and other forms of interaction to convey the same emotions and ideas.
It could be other elements from Japanese folklore. There are many supernatural beings and concepts in Japanese mythology that might have influenced his creation.
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.