These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Noroko is a great source of this. She usually has no face, but randomly, in her idle pose, she acquires two sunken pits for eyes and a mouth, and emits a horrible screech. One of her moves involves faking a cry and, if the opponent hits her in this state, she'll turn all red and scream loud as hell, sending the opponent flying. The "Soul Punishment" special involves her playing volleyball with the opponent's soul. The final hit, after an instant of complete silence and stillness, will sometimes flash, very quickly, some creepy image, like her doll covered in blood, or a close-up of an eye, followed by (you guessed it) a scream. And if the opponent dies with that final hit, the soul doesn't bounce back to the body, like it normally would; it is destroyed.
And then, you have her fatal move. Remember her "fake cry" move from above ? The same, but from the point of view of the victim.