#ckret2 already expanded on the pronouns thing and made it pretty clear it wouldn't go this way

[fannishstuff]

Okay but I can't stop imagining Mabel reading this post, quietly nodding, and then the next day:

"Hey, I'm looking for Bill. Have you seen tri?"

"Yeah, he's up- ... Wait, seen him try what?"

"Oh, Grunkle Stan. I figured that since treir not actually a boy, I'd see how quad likes more shape-ey pronouns!"

Ford the Grammar Pedant is desperately trying to figure out HOW and IF he should correct this.

Dipper walks in: "Wait. Does Bill use neopronouns now?"

Ford has been out of touch for thirty years and does not know how to react to this term.

"Maybe. I'm gonna ask trem! Or tri. Dipper, can you help me figure out some old-soundy words to use?"

"Uhhh, sure, I guess. But hold on, I'm going to have to write this down..."

Bill walks down the stairs. "Write what down?"

"Bill bill bill! What do you think about triangle/quadrilateral pronouns? Or quad-tri-treir for short"

And Bill just:

So, they spend the entire rest of the day with Dipper face-deep in old translation dictionaries and thesauruses while Bill explains the finer points of what Mabel calls "gendometry" ("No, see, I'm a square not a quadrangle - good catch, though, my dad was a quadrangle! Super inclusive."). Dipper lists the relative merits of Hebrew versus Greek versus just using words like "Equal" or "Degree." (Mabel was just using prefixes she learned in school. She didn't even think of fancy etymology. Dipper is super proud of himself for something Bill-related for the first time all summer.)

Ford briefly pulls the "Well, if Bill likes it that's reason enough for me not to do it."

Dipper cuts himself off halfway through a 'I'm not sure these are all practical-' to gape in horror. You can't just DO that, Grunkle Ford!! That's AWFUL!!!

Sputtering a bit, Ford looks to Stan, who just shrugs.

"Look, I don't get it all the way either, but you gotta listen to what people tell you."

Bill grins. "It's alright, Sixer. I don't mind if your puny human brain is too stupid to get it. Even if two spazzy teenagers can!"

And that just Does It.

Dipper comes up with a new system practically every day based on whatever Bill said that morning, which ranges from a sincere "This is a kinda 4-D day" to intentionally trying to screw with him. Regardless, Ford has to basically reverse engineer the whole thing or risk vicious mockery. Mabel uses whatever Bill tells her and has no difficulty switching halfway through a sentence. Wendy uses whatever Mabel last used. So does Soos - in fact, his slow and direct speaking style makes him surprisingly flexible.

Stan waits until Ford is downstairs to say: "Look, imma be real with you, I'm way to dumb for this. Can I just, I dunno, use they or somethin?"

"Look, Fish, I literally could not care less what you losers call me. He/him is fine."

"Got it."

(He still tries the pronouns of the day when he remembers, but usually defaults to "Bill-whatever" or "trongldy-dodad.")

Follow up on Bill gender: Bill and Mable's gender conversation implied that one could have a number-of-sides identity which might not be reflected by your... assigned shape? This analogy is breaking down. To the question: Do you think that was true in his real life home dimension, or just something he was chill about on a whim? Will it ever come up in the fic?

Yeah, there were trans shapes. Bill is one of them! Like I'm calling him "triangle" for simplicity but really it's pyramid which is like 4/5 triangle and 1/5 square simultaneously in a higher-dimensional way, but like also he's been calling himself a spherical triangle for literally a trillion years and he's still kinda loyal to that identity because he's only been thinking of himself as a pyramid for 4000-odd years, and spherical triangle captures some of the experience of being 2D in a 3D way but not all of the experience and it leaves out the squareness so pyramid's more accurate but "pyramid" doesn't reflect the whole "grew up with psychic powers" experience and Bill thinks being psychic is an important part of his gender identity still so like he's wondering whether fourth-dimensional hyperspherical pyramid is the best fit, but he doesn't FEEL 4D, he feels 2D in a 3D way—you know what, you know what, it's complicated, you're just a human, you can call him a triangle, it's fine, it's close enough, really, he's somewhere under the triangle umbrella, it's fine, don't worry about it, really don't worry about it, it's cool, he's cool with it.

Hectorgon decided somewhere along the way that he didn't feel like a 2D hexagon anymore and got some work done and is a 3D hexagonal prism now and is content with it. Amorphous Shape has stuff going on with them Bill can't even beGIN to make sense of but sometimes they look like a bunch of squares and sometimes they look like a bunch of other polygons and everyone just nods and goes with it, and tbh naming yourself Amorphous Shape is sort of like renaming yourself Genderfluid Human and then all your friends nickname you Derf. Bill's dad was intersex in one direction and picked up a trans-ish gender presentation in a totally different direction. As a child Bill met another spherical shape that looked like a line in the second dimension but in the third dimension was a polygon—a biangle—struggling to get that recognized as an actual sex.

And all this is like, the shape equivalent of having a gender that can't be described with anything less than five terms and a freshly-baked set of new neopronouns. There were also more conventional trans identities—assigned squares who wanted to be seen as lines, triangles who wanted to be seen as pentagons, hexagons that were sometimes hexagons and sometimes octagons, septagons that felt sideless, etc.

Bill's stance on all this since he was equivalent-to-a-teen has been Anybody Can Do Anything They Want Forever.

He got in fights with his dad about whether including biangles when greeting his audiences—"Welcome, lines, bis, and tris; quads, quints, and more"—would alienate the Traditional Members Of The Audience.

I don't know how much of all of the above will ever actually make it into the fic aside from discussing biangles.