Hermione and Ron are great to include. Hermione can help Harry and Ginny with their studies and also be part of their anti - Umbridge plans. Ron can add some comic relief and also be a good friend to both of them during this year.
Definitely include Fred and George. Their mischievous nature can create some light - hearted moments in the otherwise tense fifth year. They could also help Harry and Ginny in some sneaky ways, like getting around Umbridge's rules. Seamus and Dean could be good side characters as well. Their different reactions to the events in the fifth year, especially with the rising threat of Voldemort, can show the diversity of the student body at Hogwarts.
Hermione and Ron are great choices. They are Harry and Ginny's closest friends. Hermione can add her intelligence and practicality to the story, like helping with the wedding preparations or giving relationship advice. Ron can bring in his humor and loyalty. His reactions to Harry's engagement can also be quite entertaining, like being a bit jealous that Harry is getting married first.
Luna Lovegood would be a great addition. Her unique perspective on magic could offer new insights to Teddy. Also, Ron could be included as Harry's best friend. His humorous and sometimes clumsy nature could add some light - hearted moments to the story.
Ron Weasley could be included. His friendship with Harry and his own skills (even if he's not as good as Harry or Ginny at Quidditch) could bring some comical moments. He could be the team's cheerleader or the one who always has a joke to tell in the locker room to ease the tension before a big match.
Hermione would be a great addition. She could be the one who accidentally discovers their secret and then has to decide whether to keep it or tell Ron. Neville could also be involved. Maybe he stumbles upon them in the greenhouse while they're having a secret moment and he becomes their accomplice in keeping the secret.
Hermione could be a great addition. She's Harry's best friend and Ginny's sister - in - law. She could offer advice to both of them during their relationship struggles. For example, when Harry is too busy with his Auror duties and Ginny feels neglected, Hermione could step in and help them communicate better.
Adding Draco Malfoy could create some interesting drama. He could use Harry and Ginny's jealous games to his advantage, maybe trying to drive a wedge between them. And of course, the Weasley family as a whole. Molly Weasley could notice Ginny's behavior and have a motherly talk with her, while the other Weasley siblings could have different reactions to the whole jealous situation between Harry and Ginny.
Ron can also be included. He might be a bit clueless at first about their relationship, but then he can become a source of comic relief as he tries to play matchmaker or accidentally gets in the way of their romantic moments.
The main antagonists could be the Death Eaters still loyal to Voldemort. They would be trying to undermine Harry and Ginny's efforts to protect Hogwarts and the wizarding world.
Harry would likely develop by becoming more at ease with his post - war life. He might start to let go of some of his trauma and be more open to having a normal school experience. Ginny, on the other hand, could become more confident in her leadership skills, especially if she's involved in any school initiatives. Their relationship would probably grow deeper, with more shared experiences and understanding.