Board Thread:General Discussion/@comment-24100805-20160201152915/@comment-38451037-20190301053752

User1204 wrote: Toby Fox confirmed Frisk's gender to be non-binary. I have no idea about Chara though. Wait, since when?

Because usually they keep the true identity of the character you control a secret. Unless, of course, you're refering to the tweet where he confirmed that he made both their genders (Chara and Frisk) ambiguous by design so that it's easier for the Player to project themselves into (and yes, Chara's ambiguous as well, since Asriel use the "they" pronoun when refering to them).