Sprunki began as a fan-made mod of Incredibox, the music mixing game where players drag icons onto characters to build loops. Its horror mode became the mod's most shared feature, transforming bright singers into darker versions with distorted sounds and unsettling visuals. Fans responded by designing their own original characters, known as OCs, each with a normal and horror sound. Autumn follows that tradition, giving one creator's character a matching dark cue. Clips like this circulate in short edits and character showcases, where the brief length makes the transformation easy to replay and compare.