He might become more responsible. As a lord, he has to think about the greater good of his domain. So he may be less impulsive and more calculated in his actions.
Harry could become more diplomatic. Dealing with other lords and nobles would require him to be tactful. He would have to learn to negotiate and compromise, which is different from his more straightforward approach during the war. He may also develop a more regal air about him, with a sense of propriety and dignity that he didn't have before.
He might become more confident. As a lord, he has a certain status and power, which could boost his self - esteem.
After the betrayal, Harry might become more cynical. He may start to question his previous beliefs and the people around him. His trust in others is shattered, which could lead him to be more guarded and self - reliant. He could also develop a darker side to his personality as he grapples with the pain of betrayal.
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.
One possible plot development could be Harry having to deal with the new political and social responsibilities that come with being a lord. He might have to make decisions regarding the welfare of his land and the people in it.
His character could become more cautious. After facing so much danger, he'd be less likely to rush into things.
He might become more sneaky and calculating. Since he's a thief now, he would have to be good at hiding his actions and planning his 'heists'. His moral compass might also shift a bit as stealing isn't exactly an ethical behavior in the normal wizarding world.
He becomes more authoritative. Harry, who was once just a student and a hero, now has to make decisions for an entire kingdom. So he has to be more assertive and confident in his actions.
Harry could develop a more guarded personality. Since the Malfoys have a certain reputation, he may need to be careful about his actions and words. He might also become more calculating in his interactions, learning from the Malfoy family's political maneuvers.
Harry's character development in such fanfictions is complex. At first, he may be full of self - pity and anger about his paraplegic state. But as the story progresses, he starts to see the value in his new life. He begins to focus on what he can still do, like using his magic in different ways. He also becomes more empathetic towards others who are struggling, as he has gone through his own tough time. Through his experiences, he grows into a more well - rounded and wise character. He may also develop new relationships that help shape him further, like making friends with other disabled wizards who teach him different ways of looking at his situation.
Harry's character could change in that he becomes more of a leader. With the special abilities and heritage from Hecate, he may find himself in situations where he has to take charge. He might also develop a deeper sense of responsibility, not just for his friends but for the wizarding world as a whole. He realizes he has a different role to play now that he is the son of a goddess. Also, he could become more attuned to the more mysterious and darker aspects of magic, which might make him seem a bit more brooding at times.