Board Thread:General Discussion/@comment-26971836-20150909073035/@comment-15984194-20151013190243

Yowhatisuppeeps wrote: It's not impossible.

Pros about Gideon:

Genuinely likes Mabel

Is at least a little sorry for what he did

Has a fairly good reason to be mad and seek revenge on the pines

Cons

Summoned Bill (but so did Dipper and Ford...)

Is a brat

Lied to the people of gravity falls

Hates Dipper (and other pines, excluding Mabel) To me it seems more like an obsession than genuinely caring for Mable and he has shown a tendency to lash out against her for not going along with what he wants.