Rimuru Tempest is the main character of That Time I Got Reincarnated as a Slime, the isekai series that began as a light novel and became a popular anime in 2018. Reborn in a fantasy world as a slime, Rimuru is known for a friendly, optimistic attitude, and short clips of the character's laugh have circulated on soundboards and in fan edits. The sound works as a recognisable shorthand for anime fans, so creators reuse it for lighthearted reactions, memes and edits long after the original scene aired.