In the "prime" universe, the book seemed to have a slight psychic bond with it's creator, Ruby. The Dark One was able to sense when the book had been opened and used, and even sense when the book was tossed into a portal to Hell.
A comic book iteration of the Book of The Dead was said to have been the creation of a deranged indie comic artist, who claimed that voices of spirits from beyond were guiding his thoughts and hands as he worked. Unlike the real Necronomicon, this version was not inked in blood or human flesh, but contained many of the same passages found within the original. While it is unclear how many copies of Necro-Comic-Con were made, at least one is known to exist, as it eventually ended up in the possession of then-newly elected President Barack Obama while he was visiting a Detroit comic convention. After skimming through the comic's pages and finding it too strange for his taste, the President destroyed the book by tossing it in a roaring fireplace in the White House.
For the movie, a video by Rotoscopers from 2013 and early information regarding the movie's plot somewhat implies that Baymax was originally going to be built by Hiro only after Tadashi's death to fill his void, just like in the comics, before this was changed to Tadashi being his creator instead. 2b1af7f3a8