NEW YORK — In the colorful, animated, musical world of “KPop Demon Hunters,” everyone is a fan. The general public rocks T-shirts supporting their favorite idols. They hold light sticks and stare starry-eyed at stadium stages; they scream, they cry, they cheer, they buy the merch. It shouldn't come as much of a surprise, then, that the Sony Pictures/ Netflix film itself has inspired similar fanfare, having topped the streamer’s global rankings.