Wait, so if Alcor is in another dimension during the transdimensional arc… what about Mizar? Is the transcendance dimensions’ soul just sitting there in a normal life during this?

Well, yeah, pretty much. Either there hasn’t been a new reincarnation yet and the soul itself is just kind of hanging out or the Mizar of that time is doing their own thing. All Mizars have lives outside of Alcor – even the ones who accept him as family.

During an adventure without Alcor during the Transdimensional arc, when Dipper and Mabel with others are in a tight situation, Dipper actually has a summoning charm for Alcor, but initially reluctant and stubborn to use it since it’ll mean he can’t do things on his own and needs Alcor’s help. It’s only when the others are in real trouble and no way out does he use the summoning charm to summon Alcor.

Alcor never, ever, ever lets Dipper hear the end of it for the rest of the summer.

In the transdimensional arc when Dipper was still wary and distrustful of Alcor and trying to get rid of him (and failing), a self proclaimed demon hunter (to others he’s just an eccentric loon) arrives to capture this new demon he “sensed” and won’t rest until he’s hunted the demon. Dipper doesn’t know if he should help this person or just keep out of their way. Alcor meanwhile sees it too funny to pass it up,

Fic Open Season!