NOBODY'S GENDER IS UP TO INTEPRETATION
Oh my God how many times do we have to say it?! Do you people not read rules before interacting in this subreddit?! Dear God. The reason behind we keep calling Kris, Frisk and Chara nonbinary is because they have an ambiguous gender expression and neutral pronouns. Also they were created long ago when the knowledge of "nonbinary" was almost unexistent, besides the fact that nonbinary is a spectrum and we barely get ANY nonbinary or gender-non-conforming representation in media, so we call them nonbinary the same way you would call a she/her character a girl. Because it's so hard to write a characters identity without making it seem random like "hi i am Seam and I am nonbinary" in a conversation that does not happen online, we must assume it on pronouns. That, of course, doesn't have to stop people from headcanoning Kris as transmasc (as long as it doesn't erase the nonbinary part, bcs since we barely have nonbinary characters anyway that would just be an asshole move) or Ralsei as a transfem (even though I dont like this headcanon at all, people have their evidence and I can't argue their theory and headcanon despite how i think we lack feminine men in media, but we got nbs even less so, also headcanon can diverge from canon just fine as long as you dont remove representation of something that lacks a lot) or even a canonically male character as a girl bcs again, headcanons can diverge from canon and its okay, just dont remove representation.
What I'm saying is, removing such a rare representation is just taking money from the poor. It is an asshole move and youre taking out the little highlight us nonbinaries have (yes im on the nonbinary spectrum). Now if you excuse me, ban yourself off this sub if you disagree.