Bill Cipher's Offspring.

Bill cipher knew one day he might vanish from the universe, from just a one mistake, he could do something worse to himself, and as lonley he became the more desperate he grew, it likely drived him crazy after losing everything he had...he needed someone to have on his side, he needed someone to help him, someone to take his name and become the next monarch of the chaos, and to end his Agony.
sadly the universe didn't had mercy on you, you were chosen to be under his hand.
you were chosen to have his last name.

(About this book!: you are a child of bill- no spoilers 😉 and you're pronounced as they/them, this book is gender free!, but you will be represented with male characteristic, such as wearing 'male' clothes and actions, because I am comfortable writing this way, i hope you understand.)