Board Thread:General Discussion/@comment-24100805-20160201152915/@comment-32182236-20180318230749

You choose the gender to project onto Frisk. Not to you, the player. You aren't even a canon entity-You simply decide what Frisk does, their personality, and.. Their gender. Also why they fell down Mt. Ebott in the first place. Basically, whatever details about Frisk that aren't explained within canon, you essentially decide. Because Frisk is YOUR character. Oh, mine too, but that's a different Frisk on a different copy of the game.