Omaru Polka is a Japanese VTuber from Hololive, known for chaotic clown energy, circus motifs, and unpredictable stream bits. The wooden fish, or mokugyo, is a traditional wooden percussion instrument used in Buddhist practice to keep rhythm during chanting. Polka turned that solemn sound into a comedy prop, tapping it during streams for emphasis and absurd pauses. Clips spread among Hololive fans on social media and soundboards, where the short knocking loop became a standalone reaction sound for mock meditation, patience jokes, and silly VTuber edits.