Buggy fanfiction could refer to fan - created stories that are full of flaws or 'bugs'. Maybe it has plot holes, inconsistent characterizations, or grammar and spelling mistakes.
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.
I'm not entirely sure specifically what a 'buggy raftel fanfic' is about without more context. It could potentially be a fan - created story involving characters named Buggy and Raftel, perhaps set in a fictional world that the original source material (which I'm not sure of) has established.
I'm not sure which specific 'little buggy story' you mean. There could be many stories about little bugs. It could be about a little bug's adventure in a garden, like how a ladybug explored the different flowers and made friends with other insects.