This book and the universe is one big missed opportunity.
Firstly the main character is interesting and likeable, but the book lacks an antagonist. It doesn't have one. Nothing actually happens, it's like Harry Potter without Voldemort, the Slytherins and any monsters, just Harry going to school in Hogwarts.
Secondly, the universe has so much potential that is completely wasted. If in the world of literary characters the protagonists come to a life when the books end, so shouldn't the antagonists of those books, too?????? Bringing in all their hate, greed and evil intentions with them when they wake up in the After?
The "After" should have regular zombie infestations, evil alien invasions, outbreaks of infectious vampirism and werewolfism, dangerous religious cult groups, murders, rapists, ghosts, evil monsters of all kinds lurking in the dark, in short, everything that human authors have thought up as antagonists should show up in the After.
And the librarians should have the task to view newly incoming books for impending threats and recruit characters and offsping with suitable talents in magic, futuristic technology and military skill to fight the evils that spill out of that literature. They should organise a police and military force to keep the inhabitants safe from those, regulate potentially dangerous or annoying character traits like vampirism, regulate the parts of the after dedicated to erotic literature and it's characters.
How about the Librarians recruiting and dispatching a bunch of Scifi heroes to eliminate the threat of an evil, sorcerous dragonrider. How about having to recruit superhero characters to eliminate z0mbie outbreaks. How about regulating the influence of a bdsm themed part of the After accessible to the curious but rather innocent characters of the historical romance section. How about vampirism that is transmitted through bite spreading through the population.
Another problem, in the historic novel section there should be dozens of different "interpretations" of a ton of historical figures. Like 50 Julius Cesars, 100 Mata Haris, a few Hitlers etc. How do they get along when they meet in their themed corners of the After? Do the Hitlers all gang up to try to take over their portion of the After? And who would the Librarians send keep them from taking over the whole After, trying to purge it from all inferior non aryan inhabitants?
And if you are an inhabitant of the After and you read a novel you like, wouldn't you be tempted to go and meet che characters? I definitely would!
So many possibilities for interesting antagonists, cool administrative positions for the Librarians, interesting things to do and people to meet.
All wasted, unfortunately.
If the author reads this! Please go back, thinks the cool universe you created through to it's logical conclusion and use it to it's full potential, which is quite amazing. And then take the character and the universe and start writing the story from scratch.