Originally posted by Scott

There is actually an interesting answer to the question of who, exactly, was marking portions in red and making notes in TFF.In the beginning, there was an idea that the book should be from the perspective of an in-universe investigator trying to solve the murders from FNaF 1. However, that scope seemed too limited and wouldn't have been able to discuss gameplay strategies, since it was an in-game character.Then it was changed so that the perspective would be from out-of-universe member of the FNaF community, also investigating, trying to piece together the puzzle. But this would have ultimately been disappointing since the book wasn't designed to solve everything.So then it was changed to be an in-universe online blogger trying to solve the mystery, but who had an alternate agenda and was trying to mislead readers of the book. However, this was effectively creating an in-universe character and adding to the lore, which I didn't want to do.So, the identity of the "author" changed many times, and the underlines and red markings are the remnants of those previous characters, two in-universe, and one out. One was on a mission to solve the murders, one was on the trail to the solve the game, and one was on the trail to deliberately mislead you.