Little is documented about who first recorded otaku soy Army soy, so its history is mainly in how it spread as a short TikTok trend sound. The clip pairs otaku, a term for devoted anime and manga fans, with Army, the name for BTS fans, turning a simple Spanish self statement into a badge for people who belong to both worlds. As creators reused it for reveals, cosplay clips and fandom jokes, the phrase became recognisable on its own, even without any longer song or scene attached to it.