Neco-Arc is a gag character from Type-Moon works connected to Tsukihime and later became especially recognizable through Melty Blood appearances. Short voice clips like “Yanyan Yaan” spread widely in anime meme circles, remix videos, and social posts because the character’s bizarre voice is instantly identifiable. The sound stays popular because it is brief, easy to place over reaction edits, and tied to the broader online revival of Neco-Arc as a chaotic mascot in fandom meme culture.