Image source: http://vignette2.wikia.nocookie.net/vsbattles/images/0/04/Frisk_Render_By_Skodwarde.png/revision/latest?cb=20151119000230

Frisk is the player character in Undertale. The game’s narration and characters all address them with “they/them” pronouns, pointing to an ambiguous gender identity.

LGBTQ References in this game series:

Undertale (2015): Alphys and Undyne; Frisk; Mettaton; Napstablook; Royal Guard

Deltarune (2018): Alphys’ Computer; Bloxer; Kris; Noelle

Citations: 

1. Spoilers: Use of pronouns (n.d.). Retrieved from https://www.reddit.com/r/Undertale/comments/3nl6u2/spoilers_use_of_pronouns/