Usada Pekora is a Japanese VTuber from Hololive's third generation, known for her rabbit ears, mischievous laugh and intentionally broken English that fans lovingly quote. Her pronunciation of thank you as senk you became a running joke across clips, shorts and memes, with I'm so happy often attached as her cheerful catchphrase. The line spread through VTuber compilation channels and TikTok edits celebrating kind moments. It endures because it captures Pekora's warm, chaotic idol persona in just a few seconds.