Ralsei is one of the main characters in Deltarune, the role-playing game by Toby Fox that began in 2018 as a follow-up to Undertale. Known for his kind, earnest personality, he quickly became a fan favourite, and short clips of him have circulated widely as a meme sound in edits, reaction videos and fan animations. The appeal of this particular clip is its affectionate mockery: fans love Ralsei, so hearing him sing badly feels like an inside joke rather than an insult, which is why it keeps appearing in new Deltarune edits.