The exact recording behind this clip is undocumented, so no single character, show or creator can be confirmed as its source. What is documented is the word itself: 'suko' grew out of Japanese internet slang as a playful rendering of 'suki', to like, and fans began chanting it in repeated bursts to hype up the characters, idols and moments they love. Short vocal clips like this one circulate on soundboards because the chant is instantly recognizable to anime and meme communities, and its brevity makes it a handy reaction sound. It endures as a small, good-natured expression of fandom.