THIS IS MY FIRST FEMALE UNDERTALE OC. WOO.Alice (Last name, probably Teruko) is a human-demon hybrid, and sort of the daughter of Terracus, and daughter of Lauren Teruko, who was Spectron's former crush who broke his heart. She is usually seen as the daughter of Terracus, though their relationship is tense.
When Lauren became pregnant with her boyfriend, Spectron supposedly killed Alice, who was Lauren's infant. Terracus had cursed Lauren, and replaced her boyfriend's D.N.A with his own. Now being half shadow demon, she survived the impalement, but fell unonscious. Terracus came later on, took her, and caused her to age 16 years. He then put knowledge into her brain so she wouldn't be like an baby in a teenager body. Terracus raised her to serve the Sins and fight. She was then dubbed "The Nightmare Princess".
Alice can be very sociopathic at times, but this is because of Terracus abusing her and treating her roughly. She hates him, but she knows she could never defeat him. She also hates what she does, although a part of her likes it. That part is the sadistic nature that Terracus tries to coax into her. It is very hard for her to feel mercy, but, surprisingly, she is capable of feeling it.