Time to address this issue.
I don't care if they're non-binary and shit like that.
There's something called a headcanon.
If someone wants to call Kris a "him", let that user be.
Don't go attacking individuals because they called a genderless character one of the 2 genders.
Not looking for drama here.
Besides, my headcanon is that Kris is more on the masculine side and Chara more on the feminine side, to me it is, and that's actually what the majority of the UnderTale fandom's headcanon also is.
As for Frisk, I'll consider Frisk a "them" still because I really don't know.
People have their own headcanons, so don't be harassing other users for that.
(Referring to one of YellowBlack's posts here)