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.
Well, there are several common themes in 'jjk x bts vampire fanfic'. For starters, the concept of immortality is often explored. How do the characters from jjk and bts deal with the idea of living forever as vampires? Another theme is the transformation. Whether it's a character from jjk or bts becoming a vampire or dealing with the changes that come with it. And of course, the theme of secrecy is also there. Vampires usually have to keep their true nature a secret, and this can lead to a lot of tension and drama in the fanfic, especially when the characters are in a world full of humans and other supernaturals.
There's also 'Jujutsu and Bungo in an Alternate Realm'. This fanfic delves deep into how the powers from both universes would interact. It shows the characters trying to understand each other's abilities and form alliances. It's a long read but definitely worth it for fans of both series.
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.
Well, it could be about a BTS member accidentally running into a gymnast YN at a sports event. Maybe they get to know each other gradually and BTS is inspired by YN's dedication in gymnastics. It could also involve YN getting a chance to perform at one of BTS's concerts, creating a unique and exciting plot.