About the AUEdit
Spawning from fanart, this AU places the Big Four, and other such characters in the fandom, as characters from Gravity Falls.
The Big FourEdit
Given his bookish and painfully curious way of thinking beyond the parameters of those around him, Hiccup is usually portrayed as surrogate to Dipper Pines. The Dragon Manual or a book version of the Dragon Eye can serve as Journal #3, or any of the other two journals.
Given Jack's natural connection to the supernatural, he is usually portrayed as himself. Fans have also placed him as the small dream demon, Bill Cipher.
Since Rapunzel is a free-spirit like character and is ready to do what she can to help her friends and family, she is commonly portrayed as Mabel Pines.
Given their natural connection to the supernatural, they are usually portrayed as themselves.
Given Pitch's natural connection to the supernatural, he is usually portrayed as himself.