Her Personality: 

When the Helltaker first encounters Lucifer at the end of level 8, she introduces herself saying the player is worthy by passing all of her trials, giving a offer to pledge their soul to become her most treasured slave. The player is given two options to respond with:

1. "Yes my queen!"
2. "No, thanks. But you can join my harem."

If the player selects the first option, Lucifer calls the player a eager little soul. The player is given a "Bad End" screen, which says "As you knelt, she planted a kiss on your forehead, and your life melted away."

If the player selects the second option, she will respond with what the Helltaker is accomplishing by slaving demons to his own will. The player is given two options to respond with:

1. "Call me master. And ask for permission before you speak."
2. "I can offer coffee, turn based strategies and chocolate pancakes."

By selecting the first option, Lucifer talks how she will have to teach the player their place. The player is given another "Bad End" screen, which says "She made a hand gesture, and all your blood turned into vinegar. It's hard to explain the feel."

If the player selects the second option, she questions how the player came all the way to there only to buy her over with pancakes. Luckily she has a thing for pancakes.

Try To Imagine On what she Might sound like from the Game that she's From!😎

Ref: https://www.youtube.com/shorts/FwMY-lRYXJA