The 'Bioshock Graphic Novel' is significant as it expands the Bioshock universe. It gives more backstory to the world of Rapture. For example, it might show how certain characters came to be in Rapture or what events led to its decline in a more visual and narrative - driven way compared to just the game.
The plot of 'Bioshock the novel' often revolves around the dark and dystopian world of Rapture. It likely involves the exploration of the underwater city's fall from grace, the ideological battles between different factions, and the struggles of the protagonist within this nightmarish yet fascinating setting.
The story length in Bioshock is quite subjective. Generally, you can expect to spend at least 12-15 hours to get through the main story arc. However, if you're a completionist and want to uncover all the secrets and extras, it could easily double that time.
In Bioshock 2, you're thrown back into the decaying and dangerous Rapture. The story follows your journey as a Big Daddy, uncovering dark secrets and facing new threats. It's a complex tale of survival and redemption in a fallen utopia.
I'm not entirely sure which specific characters are the main ones in the 'Bioshock the novel', but it's likely to include some sort of protagonist who ventures into Rapture and has to deal with the various threats there, like the Splicers and Big Daddies. There may also be some sort of antagonist representing the controlling or corrupt forces in the city.