Board Thread:General Discussion/@comment-25548156-20141014225707/@comment-4854965-20141020035256

(Pardon the odd appearance of this post, but I figured I'd go for straightforward)  My author theories:

1) Future Dipper.  Supporting evidence: (a) in Dipper's and Mabel's Guide to Mystery and Nonstop Fun, future Dipper and even-further-in-the-future Dipper appear, and (b) in Bill's entry in Book 2, it says "He's in my wallet" with a drawing of a -12 dollar bill.  Dipper is the only person we know of that has a -12 dollar bill (besides Trembley, though by this logic, it could very well be Trembley).

2) Future Mabel.  Supporting evidence: (a) Future characters is not out of the question and has been mentioned in both the book and in the trailer.  In the second trailer for 2x07, they shrug off the idea of Mabel being the author, but with all of the theories of the viewers being misled, this could be another example, and (b) in the trailers for 2x07, there is a single frame that has a picutre of Grunkle Stan and of Mabel and the phrase "is the author."  Assuming it's not Stan, then it may very well be (future) Mabel.

3) Alternate Stan.  By this, I mean that something may have happened that caused the author to "become" Stan as we know him now.  Supporting evidence: (a) Stan knows about a lot of the weird stuff happening in Gravity Falls, but seems to be missing a few little pieces.  If he himself wrote the book, he would have known about the invisible ink.  (b)  He had the six-fingered glove in the basement, and while talking to himself (also in 2x01) he touched the handprint on the cover of Book 3.  The way that this was animated implies some relation or significance between Stan and the book.  (c) The shapeshifter said "that six-fingered freak hasn't been himself in 30 years", which may mean that the author is someone we know in the show but, as I said in the previous idea, that the author has had something happen to him/her.

4) Gompers.  Who knows?  He is present pretty much everywhere.  Maybe the author switched bodies with the goat...