One possible plot twist could be that Fem Harry's identity as Makarov's granddaughter is initially kept a secret from the main characters. This could lead to a situation where she is unknowingly working against her own family's interests at first. For example, she might be involved in a mission that is actually aimed at undermining Makarov's plans, but when her true identity is revealed, it throws everyone into chaos.
Her character could develop through self - discovery. As she learns more about her relation to Makarov, she starts to question who she really is. This could lead her to explore different aspects of her personality that she had previously ignored. For instance, she might find that she has a more ruthless side like Makarov, but she tries to temper it with her own sense of justice.
Another plot twist could be that Aro has some grand plan for Bella that goes against what she wants. For example, he might want her to marry a certain vampire from his coven to strengthen their family's power, but Bella is in love with Edward. This would create a huge conflict between her loyalty to her new - found family and her love for Edward and the Cullens.
A possible plot twist could be that Fem Harry initially believes Morgana le Fay is a hero, but later discovers that Morgana had a hidden, more sinister agenda all along. This would force Fem Harry to re - evaluate her connection to Morgana's magic and her own identity.
One possible plot twist could be that the inheritance is cursed. Instead of being a boon, it brings trouble to fem Harry. For example, every time she tries to access a part of the inheritance, she is plagued by dark visions or dangerous creatures.
One possible plot twist could be that the pregnancy is part of a larger scheme by a third party. Maybe Voldemort or some other dark wizard has manipulated the situation to either gain control over Lucius or to use Harry's unborn child for some dark purpose.
A great plot twist could be that when she is reborn, she discovers that her family has a hidden dark secret that was covered up for generations. This changes her perception of her family and her own identity.
Well, one possibility could be that the story explores the conflict of her being related to Makorov while having different values. Maybe she tries to redeem her family's name. She could use her magical abilities (assuming Harry still has magic in this AU) to fight against the dark deeds associated with Makorov's past.
One possible plot twist could be that Snape has a hidden agenda all along. Maybe he's been using Harry as a pawn in a bigger scheme related to the wizarding world's power struggle. Another could be that Harry discovers a long - lost family connection to Snape that changes their dynamic completely.
A possible plot twist could be that Merlin is not actually dead but has been trapped in a different dimension. Harry, as his son, has to find a way to free him. This would completely change the dynamic as they could then fight side by side against the forces of evil.
One possible plot twist could be that Fem Harry discovers one of the orphans has a magical ability she's never seen before. This could lead to a whole new adventure as she tries to figure out what it means and how to help the child control it.