She is very mysterious, and not much is known about her at the start of the game. You will not meet her until you're in the second year of game or later. Additionally, you must collect three Black Fragments to get the blueprints for the Witch Princess' house. She'll move in once you've looked at the blueprint and built her house.
Her favorite color is purple, and she loves anything grape! The Witch Princess is always thinking of ways to trick the Harvest Goddess and loves to work on her spells. She's somewhat mischievous, although she means well, and will show her true emotions once befriended.
You go to her house to change your character's skin complexion, eye shape, and eye color. This is available on Mondays from 10:00 AM to 6:00 PM, Tuesdays from 10:00 AM To 6:00 PM, and Thursdays from 10:00 AM To 6:00 PM.