Here I'm going to lore dump about characters in the Half Reversed Reunion AU. Actually, it's more like a personality dump.
Mabel and Gideon are pretty similar to their canon counterparts. However, Gideon, like in the traditional/regular Reverse Falls Gleefuls, has enslaved Will.
Will Cipher is reverse Bill Cipher. He's usually whiny, I think, but in a lot of stories the Gleeful twins literally torture him so . . . he can be a little whiny.
Pacifica is Pacifica Southeast. She and Mabel became best friends after a brief mini golf rivalry when they were younger. She's much more cheery than her canon counterpart but can still be sassy.
Dipper is much more serious/solemn than canon, and he's not a murderer or a torturer like many Reverse Dippers. He has the tendency to just Say Things.
I know I said Gideon earlier, but here I'm going to write that he's spoiled and generally gets whatever he wants, plus the amulet he has is corrupting his soul like in canon. Dipper is closer to his mother than he is and he's jealous of that. It's his own fault because of reasons that I may make clear here or I might wait until I write the story to reveal.
Soos is similar to canon, except he works for the Gleefuls. Half the reason he stays around is to keep an eye on Dipper, though.
Robbie is the cashier in this universe and Wendy is the handywoman. They have an on again/off again relationship that's going nowhere. They both have similarities to their canon counterparts but Robbie's a little softer, so to speak, and Wendy's a little more edgy.
The story is focused on the four kids so I haven't spent much time on what the Stans are doing. Stan is running the Mystery Shack and Ford is traveling around studying, probably.