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Oh yes. Delicious
So why couldn't X!Gaster make the marks go away? If he wanted to "fix" Cross being trans, I feel like that would be a easier way to do it
hello again! i assume this is the same anon xD
i'm sure that that's how he would have eventually chosen to "cure" cross' transness if he'd gotten around to it in time, but in TAU, "code" is something of a misnomer in the first place - it's not something as "easy" (in quotes because code is a pain in the ass for me) to read and understand as like, python or javascript, and especially not in living, sentient entities who are constantly taking in new information, processing it on multiple levels, and generally just... yanno, changing.
so 1: in order to erase cross' transness he would have had to do a deep-dive on a huge tome of code that was actively changing and growing underneath his feet, and 2: in order to delete only that part of his code and nothing more, he'd need to know where it came from.
and the trouble, here, is that cross is not actually a "pure" sans.
in fact, speaking more meta - gaster would have no way to know this for sure - i'd like to think that cross' eye markings are technically because he's part toriel. not a super significant amount, mind you, but he is the only person in nightmare's pantheon who can heal, he inexplicably loves to bake even where swap/blue doesn't, and in certain AUs where he reaches LV 20... he mysteriously grows horns.
again, speaking meta, i would have to assume that his eye markings are probably related to that bit of code - but in order to find and erase it, gaster would have to basically destroy his sense of self and start over. so even if he'd gotten to that point and tried to "fix it", he likely would have given up anyway simply because it wasn't worth the work it would take - and in that case, there are easier "solutions" to be had.