Sub-AU
This fandom is crazy , so we have AUs of AUs .
Friends with tax benefits
An AU in which Mabel made Dipper and Henry promise to get married if she died, which is exactly what she did whilst giving the birth to the triplets. Henry and Dipper marry and thus become " friends with tax benefits " (as their relationship is not in any way sexual). In this AU ,Dipper is even more protective of the children and Henry, and takes care of Henry's reincarnations just like he takes care of Mabel's. Henry become the woodsman much earlier, and at one point even gives Dipper his soul.
Equivalence AU
In this AU, Mabel is the one who became the demon, while Dipper remains human.
Drift AU
The Drift AU is a darker version of the transcendence AU, in which Mabel, just like everyone else, can't see, hear or touch Dipper. Dipper, unable to have contact with Mabel, gives in to his demonic ways and resembles Bill a lot. He is proud to be a demon , does not go easy on child summoners and loves soul, human and blood sacrifices. He gains his power much faster than in the original AU, due to all the sacrifices he receives.
As he gains the abilitly to interact with the physical world he tries to contact Mabel, which lead her to the belief that he is a ghost and is hauting her. After she tries to help him get to the afterlife and he says that he can't, she suspects that some demon is messing with her which she things is confirmed when a summoning circle apears on her desk. At first she tries to ignore it but as she is still getting " hauted " she gets desperate and summons Alcor. When she sees that he is Dipper she is overjoyed that he is alive but the joy is short lived as she notices that most of is humanity, most of what made him Dipper, is already gone.
In this story Mabel, Henry and Stan treat Dipper a bit like Mark and Anna do in the original AU, just that their Dipper acctually is dangerous, and that they can't give him to someone who can take better care of him .
He tricks friends and family in deals and while he may cuddle with the triplets one minute he may be stabing acacia with a fork the next. He has severe moodswing from feeling guilty for bothering Mabel with all his demon problems one minute to only not killing her because she is his. It is still unclear if he becomes more like the original transcendence AU Dipper during his time with Mabel or stays totally insane.
AU where Mark and Anna fully accept Dipper post-transcendence
The AU in which Mark and Anna overcome their fear and fully accept Dipper...