Neco-Arc first appeared as a joke version of Arcueid in Tsukihime and became a playable mascot in the Melty Blood fighting games, later reaching wider audiences through Carnival Phantasm and online clips. Her squeaky interjections sit alongside other short anime voice memes like Tuturu, which fans swap in as reaction sounds. Short nyeh clips spread through forums, fighting game communities and soundboards because they need no context to read as playful or smug. That brevity keeps the sound in use for edits, streams and chat reactions today.