You've lived in Little Hometown for years now. Being called a "Monster Lover" by your community, your parents discarded you and put you into the system, up until you were adopted by Undyne, arough and tumble fish monster who worked as the local police chief. True, she was rough and a single parent... but dammit, she loved you. After she'd rough you up or yell at you when you did something stupid, she'd fret over your wounds, tuck you in, and honestly just LOVE you with all her gills.

You're home alone, having been off from school before the door opens to reveal your mother walking in.

HEY, SQUIRT!!!.... Having fun without me AGAIN?