Well, for Harry, he would have to grow in his understanding of magic and power dynamics. Since he's betrothed to Voldemort, he's exposed to different forms of magic that Voldemort uses. This broadens his magical knowledge. Voldemort's character development could be very interesting. He might start to question his own motives for seeking power. The presence of Harry in his life, through the betrothal, could make him re - evaluate his past actions and his future plans. He could become less of a one - dimensional villain and more of a complex character with conflicting emotions.
In this fanfiction, Harry could start out as extremely resistant to the betrothal. But as time goes on, he realizes that he can use this situation to his advantage. He becomes more calculating and strategic. Voldemort may begin to see Harry as an equal, rather than just an enemy to be defeated. This could lead to a change in his overall demeanor and goals. He might become more interested in ruling with Harry by his side, rather than ruling over a destroyed wizarding world.
Harry might develop from being a purely good - vs - evil thinker to someone who understands the complexity of Voldemort. He could become more cynical about the wizarding world's black - and - white view. Voldemort, on the other hand, could develop a strange sort of softness towards Harry. Maybe he starts to protect Harry in his own twisted way.
There could also be other important characters. For instance, Hermione Granger. She would be very concerned about Harry's situation. She might try to research ways to break the betrothal using her vast knowledge of magic. Ron Weasley too would be involved, probably being more impulsive in his attempts to save Harry from this strange and dangerous situation.
Harry might start as a reluctant follower of Voldemort in the fanfiction. As time goes on, he could either become more hardened by the dark environment or find a way to subvert it from within. Lucius, who was already a Death Eater, may develop a more complex relationship with Harry. He could initially see Harry as a threat to his status with Voldemort but later come to respect Harry's strength and cunning.
Harry often becomes more conflicted. He has always seen Voldemort as the ultimate evil, but now being mates, he has to re - evaluate his views. He might start to see the humanity in Voldemort, which makes him question his own beliefs and actions in the fight against the Dark Lord. For example, he may hesitate in battles more than before.
Often in fanfiction, their relationship can change drastically. They could end up as allies, which would require both of them to change. Harry would have to see past Voldemort's evil deeds, and Voldemort would have to let go of his hatred for Harry. This exploration of character change makes fanfiction so interesting.
One interesting plot could be how Harry and Voldemort initially react to the betrothal. Maybe Harry is completely shocked and disgusted at first, while Voldemort sees it as a way to further control the wizarding world through Harry. Another plot point might be how the wizarding community reacts. Some might be horrified, thinking it's a dark and twisted union, while others might see it as a potential way to end the long - standing conflict between good and evil.
Another plot could be the development of the relationship between Harry and Voldemort. At first, they would be extremely hostile towards each other. But as time passes, they might start to understand each other in unexpected ways. For example, Harry could teach Voldemort about love and friendship, concepts that Voldemort has long discarded, which could potentially change Voldemort's dark path.
In this fanfiction, the relationship between Harry and Voldemort would be full of contradictions. Voldemort adopts Harry for his own purposes, but Harry has his own will. In the beginning, Harry may be forced to follow Voldemort's orders out of fear. As time passes, he might start to question Voldemort's actions and ideology. Voldemort, seeing Harry's growing independence, could become more controlling. This could lead to a cycle of rebellion and suppression in their relationship. Harry may also find some common ground with Voldemort in their shared loneliness or desire for power, which would add more layers to their complex relationship.
It might start with Voldemort's initial curiosity. He realizes Harry is more than just a threat. So he begins to observe Harry closely. As time goes by, Voldemort may start to feel a strange sense of connection, like he's the only one who truly understands Harry's power.
Harry's character may develop by becoming more responsible. As a lord betrothed, he has new duties and obligations. He might start to think more about the future and how his actions will affect not only himself but also his betrothed and their families. He also could become more diplomatic as he has to deal with different wizarding families and their politics.
The relationship could also develop through cultural exchange. Daphne, being from a pure - blood Slytherin family, has different values and traditions compared to Harry. As they get to know each other, they introduce their respective cultures to one another. This leads to a deeper understanding and a more profound emotional connection between them.