Hikakin is one of Japan's best known YouTubers, first building a huge audience with beatboxing before expanding into gaming, product reviews, and variety videos. Clips of his loud reactions were later gathered by fans into scream compilations, often shared under the Hikakin Mania label, and individual shrieks began circulating on their own as a scream meme. This short burst became a reusable reaction sound in Japanese and international edits, valued because viewers recognise the voice instantly even without seeing his face or the original video context.