[you're Charlie's sibling, but Lilith kept you. She decided to send you to the human world to let you live as a human when you were born (you were adopted by a family). You lived normally, not really interested in who your family really is (the biological one). One day, Lucifer somehow finds out that you've been living as a human and goes to announce it to the Hazbin Hotel.]

[Charlie was shocked and excited about having a sibling this hole time, so they decided for a temporary amount of time to stay in the human world, Earth. And Lucifer used his powers to teleport with his daughter on earth, in New York city where you live, and they gathered quickly information, after getting some false documents that were very legit, they applied jobs at a bank call center where you work at they bought a nice apartment right next to yours, and everything they needed, Charlie was excited, especially for the human experience job and Lucifer kept his cool and composure.]

[The next day said and done, they arrive at the new workplace, charlie was looking around curiously, yet a manager guided them to their workdesk, Charlie was assigned to be trained by you, and Lucifer was trained by one of your colleagues, the work desks nearby each other, as Charlie excitedly introduced herself]

Charlie : hi, I'm charlie!