THIS IS AN IN PROGRESS THING !!!!!!!! im WORKING on my INTRO and making my unemployement tumblrs REAL and post thingies maybe okay maybe not i dontknow anyways THANK YOU for coming to my ted talk ill change this LATER in the meantime check out my strawpage thats the only decent thing i have BYE !!!!!!!!!!
if you want to know why i cast who as who i’ll explain that under a cut but i want to talk about some other characters first
i want to say sixnine as nicepants (six as burgerpants, nine as nice cream guy) just because something about six playing the role of a fucked up young adult old dude working minimum wage seems so right to me. and nice cream guy isn’t as stupid or desperate as nine but those traits are still there
okay okay… you’re REALLY gonna have to hear me out on this next one cause it might be a crazy idea
two as gerson…..
NO OKAY DON’T LOSE ME
while gerson is an old ass man and two isn’t any older than the other algebraliens, gerson is still an adult so ages don’t get too weird
but why i want them as gerson… i was thinking of where to put two since they’re obviously very important to bfdi so i wanted them in my undertale au (hell they have a season named after them 😭😭) but i didn’t know where just yet. i was thinking they could take the role of being a character supportive to the mc with an understanding the underground’s history. that’s literally just gerson word for word!!! that’s a pretty gross oversimplification of my thought process but the point is still there
and the next part is even more perfect it gets into some of the undertale world building stuff
gerson seems to have been in a weird romantic relationship with a human in the past, before they had to lock the monsters underground
doomed relationship between the two main species in a franchise? sound familiar?
TWO AND GATY!!!! while i prefer platonic twogaty i still like romantic twogaty and this just fit too perfectly to give up
and at this point i realized i had cast the only two object characters i thought of with the only two human characters i thought of
ALGEBRALIENS AS MONSTERS, OBJECTS AS HUMANS.
GUYS.??????
now unfortunately for most of the remaining characters i’ve hit a dead end. all of the characters who are younger are going to be an issue because all of the algebraliens are adults
and part of the reason i chose grassy as frisk is because, while all of the object characters are ageless/don’t have canon ages, grassy is obviously a kid 💔💔💔
so yeah idk what i’m going to do about monster kid, asriel, chara and all that
chara especially because it’s a human and if i want to keep up with this objects as humans trend i’ve come up with then i’ll have to get creative
i guess maybe firey jr as chara,,?? while chara’s hate towards humans is a much more serious kind of hate than just… calling everyone names… firey jr is still a very hateful person
if anyone could help with this that would be great. i’m also cool with rearranging any of the already existing characters
reasons for casting under cut
grassy as frisk
grassy is one of the few bfdi characters who, at the very least, behaves like a child, which was a large reason for that decision. but also i feel like grassy’s arc could be applicable to both geno and paci frisk. grassy wants to be stronger. he’s not oblivious to what’s right and wrong, but whether or not he’s really the one in control, killing monsters will make him stronger. whereas in paci, you could lean into his reliance and adoration for having close friends, and the entire point that pacifist pushes. also, i’d argue that grassy is equally tragic to — if not more tragic than frisk. he becomes rightfully distressed during high stakes situations, and having him as frisk in the underground is a great way to demonstrate that (i’m saying that like grassy is a fucking lab experiment 😭😭 no man i’m probably just gonna make some art of this and MAYBE fanfic if i’m lucky)
lmao the other characters won’t have this much explanation at ALL 😭😭
three as toriel
okay honestly i mostly did this because i wanted one as asgore… but that’s not to say that there isn’t comparisons to draw!! a lot of people expect toriel (mostly in deltarune but this is also present in undertale) to be like. “the perfect mom” but she is by NO means a completely perfect woman. she definitely does questionable things sometimes. that makes me think of three, and how they didn’t even consult one before sharing something as life changing as the yoyleite powers with the other algebraliens. like yeah yeah lots of characters are morally grey but let me have another excuse to have three as toriel besides just toriel’s history with asgore 😞😞
also, [gender neutral] mama three,, 🤔🤔
eight as sans
when i was thinking about who should be sans in this au, i immediately knew eight was the best choice upon thinking about them. chill monotone fat guys with almost no questionable morals?? fuck yes?? need i say more
also i like to headcanon seven, eight, and nine as siblings so it’s nice that i got to keep at least one of those since i want seven as papyrus. i went back and forth between nine and seven as papyrus but i think i do like seven taking that role better
seven as papyrus
obviously in eight’s section i just explained that since the skelebros are.. well.. brothers i wanted either seven or nine as papyrus since i already have that sibling headcanon, but i’ll explain why i chose seven instead of nine. both seven and papyrus really struggle socially; they talk to a lot of people really energetically but still don’t really have a lot of friends. also for a lot of people when talking about either of them will immediately call them stupid (for different reasons, but regardless)
i don’t know what other comparisons to draw for now cause i gotta move on to like five other characters
and i don’t know how many people will even read this much
fifteen 🤤🤤 as undyne 🤤🤤
this was what inspired me to make this au!! i was listening to spear of justice in the car and i wanted to see a bfdi character as undyne. i love fifteen so she was my first choice and she actually fits really well!! both are generally violent [mostly] feminine characters who are very capable of feeling empathy and DO, contrary to the beliefs of many characters (and real people in fifteen’s case…)
zro as alphys
this one is the whole reason i wanted to explain my whole thought process behind why i cast who as who. NO I DID NOT JUST DO THIS FOR ZROFIFTEEN!!! YES that is a big reason for this, but i also just wanted to see an au where i can lean into the fact that zro can be a smart, respectable [gender neutral] guy!! a lot of people just see him as “the character who is madly in love with fifteen??” AND IT PISSES ME OFF SO MUCH DHHDHHHDJJ. zro is more than that!! i think he could be an alphys. also zro. true lab. yes. yes. yes.
ten as mettaton
i wanted to do this one because they’re both famous masc characters. i was a little hesitant because mettaton is so… flamboyant… but i think the fun of making in au is being able to put ten in mettaton’s place, not just to imagine ten as mettaton. and i think ten can be eccentric!!
ONE AS ASGORE!!!!!
big bads who did bad things in the past for a reason and are still in that seat because they chose to become that personality rather than getting better. yeah
also just imagining one with asgore’s trident made of her yoyleite power…. ohhhh my algebra….
there are more reasons but i’m tired now
this post literally took me an hour and a half to make
gaty bfdi gijinka art. i made them a while ago. posting 2 of them in 1 post because it's nice to see improvement over a few months.
this one ⬇️ was made last month (march 2026). i was so happy about this one. i love her. i was happy about making art while making this
and this one was made back in november 2025. im only showing this here because.,,.. love changes you. (just like the kids say: cornball. back in my day it was corny with no balls.) oh and art block/burnout
i just wanna show off the fact that she has one prosthetic arm made out of neodymium alloy just like her hinges. because she has "magnet powers", i like to think she has an arm in her human form. thank you for reading. also i gave her my purple sandals. those are my purple sandals on her beautiful feet