What do you think?

I think Frisk and Chara are genderfluid since their genders are supposed to be whatever the player thinks they should be

Genderless.

I always classify them as non-binary

non-binary

Non binary

I knew that since day 1 xD

i thought they were non-binary

hell yeah!!! an excuse to headcanon dump!!!

okok so frisk is nonbinary and uses they/them and then chara's agender and uses they/them and it/its