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.
Another alternative could be fanfiction that focuses on Grimmjow's backstory. How he became a powerful Arrancar, his experiences in Hueco Mundo before coming to the human world. This can add more depth to his character in a positive and appropriate way.
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.
Grimmjow's high - speed movement would be a great asset in the Naruto world. He could outpace many ninjas. His reiatsu - based attacks could be seen as a new form of energy - based jutsu. For example, his Cero could be like a super - powered ninjutsu blast. His ability to regenerate quickly would also give him an edge in battles against ninjas who don't have such a power.