Gerson Boom first appeared in Toby Fox's Undertale in 2015 as the friendly shopkeeper in Waterfall, a retired Hammer of Justice who tells the player about Delta Rune lore. The character returned in Deltarune, gaining new attention with Chapter 4 in 2025. Because the games use text boxes instead of full voice acting, fans create and share voiced versions in other languages. This Spanish speaking clip spread through soundboards as a quick way to reference his storytelling role in gaming edits and fan dubs.