The FL we need

FL saves the ML from a slavery auction so that she has a chance at surviving (especially since she's not actually the king's daughter and was from an affair her mother had).

FL takes dying host's body and grants her wish - to protect the 2nd prince (since the host failed to protect his sister). FL behaves a bit like a wild animal at start and gradually calms down and learns from humans a bit more. FL v smooth in unconsciously charming others.

FL focuses on maintaining power and peace in her political marriage. FL focuses on business w/ ML since she thinks he already has a lover

FL becomes the ML's translator as he only says one word and no one else can understand him but her. FL deserves the best TnT she tries so hard and so many be so demeaning towards her.

FL amasses money to plan for her future after knowing that in the future her father-in-law will abandon her for his own plans (he knows about her fatal illness and plans accordingly, but she knows her own cure so she's mostly acting now). Turns out she is very cute and charming and gradually they all want her to stay.

Brute princess falls for the devil. She infiltrates his country to court him and she also gets to see the devil's side of the war

Hybrid FL was an experimented subject and now in hiding living her life and working with herbs. MLs come to her to ask to let the curse placed on them to be alleviated so that they can use their full power again.

FL wakes up in an otome game and thinks it's all a dream so she wants to make a life long wish come true: MAKE A HAREM.

FL stays with her cheating scum of a husband crown prince as she was helpless before but now Lord of the magic tower makes a deal with her to help her become the empress.

FL's 4th life. Before she was FL and never really had a HE every time either. 4th life she's the villainess and a neglected illegitimate daughter. She decides to protect the FL because she reminds her of her 3rd life where she was helpless and no help given to her before.