Fell Sans comes from Underfell, a popular fan-made alternate universe of Toby Fox's Undertale from 2015 where characters have darker, more aggressive personalities and red and black designs. Fans created voice interpretations for the character since the original game uses only text blips, and this V2 version refines that fan voice with a deeper, cleaner effect. Clips like this circulate on soundboards and in fan edits, edits and roleplay videos where creators need an instant audio cue for the character without recording their own line.