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.
I'm not sure specifically as there could be many novels with such a title. It might be about the conflict or contrast between light and shadow, perhaps in a symbolic sense like good vs evil, or different aspects of a character or society that are represented by light and shadow.
In 'Dark Sonic vs Shadow' fanfiction, it often showcases intense battles. Dark Sonic represents Sonic's darker, more aggressive side. Shadow, with his own set of powers and a complex personality, makes for an interesting adversary. These fanfictions usually explore different power levels and the clash of their ideologies. For example, Dark Sonic might be driven by raw power and a sense of chaos, while Shadow is more focused on his own goals and past traumas. The battles can be written in a very dynamic way, with vivid descriptions of their super - speed movements and energy blasts.
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 sorry, without more information about this particular 'light vs shadow novel', it's impossible to determine the main characters. It could be two individuals named after the concepts of light and shadow, or it could be a group of characters where some are associated with light - like a heroic figure - and others with shadow - like a villain or a mysterious character.