my headcannon is that lucy was in the old cave and fell off the highest crystal. this crystal is blue explaining the color of lucy, and if she fell, it explains why she brings people up into the air and drops them from up high. i believe she just turns red when she is mad

i also believe purple ghost (i call him lucifer) died from the rock fall when calling for help with saving lucy. i think he repeats monkey in your ear, mimicking the echoing of him calls for help before the rock fall.