Put this clip at the arrival beat near the start of a scene, then follow the reveal with a teleport sound when the figure vanishes and a za warudo time stop effect for the frozen reaction shot that closes the sequence.
About this sound
This is a 0.3-second voice clip of Hachishakusama drawing out a single 'Po...' syllable, with nothing else around it. Heard on its own it feels unsettling and oddly playful at once, like a warning delivered in a soft, childlike tone before something appears.