The Villain’s Daughter in law is Inherently Powerful

After 17 bizarre possessions—including a tree, a salt shaker, and a jellyfish—she finally ends up in the body of a beastman. But this life is no easier: a powerless albino mermaid, a spy marked for death, and a background extra in a villainous household. Just as she's ready to give up, the most feared villain offers her a place in his family—as his daughter-in-law.
Can she survive among monsters without losing herself again?