Neco Arc is a cat-like parody of Arcueid Brunestud from Type-Moon's Tsukihime and the Melty Blood fighting games, and she became a breakout internet meme for her exaggerated expressions and nonsense vocalisations. Short clips of her voice spread through YouTube edits, TikTok videos and Discord soundboards, where fans reuse them as absurd reactions rather than as dialogue from the games. This stretched 'gudaniiuiuiu' line fits that same pattern as other goofy ahh sounds, staying popular because it is instantly recognisable, easy to drop into any silly moment, and tied to a character many anime fans already know.