>>283433003 (OP)
>yamamoto
Something along the lines of a Japanese ghost or undead nurse. A sensible costume where most of the work goes into the hair and makeup. If she's got time between her job and studies, she might research Hollywood blood/wound makeup techniques.
>wada
She spent all of September and October planning out a complex outfit based on a girl from her gacha (who she doesn't even like), then, after several emotional breakdowns over the couple of days prior, she shows up to the food court proudly wearing a store-bought pumpkin costume.