Neville could also be a godparent. He has proven himself to be a brave and reliable wizard. After all his growth throughout the series, he could be a great influence on Harry and Ginny's first child, teaching them about the importance of perseverance and believing in oneself.
Harry would be an obvious choice as the godfather. He and Ginny are married and he is very close to their family. He has been through so much with Ginny and would be a great source of protection and guidance for the baby.
In fanfiction, their first child might face some challenges. Since Harry is so well - known, the child could feel a lot of pressure to live up to his father's reputation. The story could revolve around how the child overcomes this pressure, perhaps with the help of Ginny's wise advice and the support of their friends. The child could also have a special bond with Ron and Hermione's children, and they could all get into mischief together at Hogwarts.
Hermione Granger - Weasley is also quite popular. She's smart and resourceful, and in fanfictions related to the Cursed Child, she might use her vast knowledge of magic to help Harry and Ginny deal with the aftermath of the Cursed Child events. Ron Weasley is another character that features prominently. His humorous nature and his loyalty to his friends can add some light - hearted moments to the often - dark themes associated with the Cursed Child in fanfiction.
The remnants of Voldemort's followers could still be a threat. They might see the third child as a symbol of the new hope in the wizarding world that they want to destroy. Maybe they believe that the child has some sort of power that could ultimately be used to completely wipe out their dark ideology, so they target the child.
The remaining Death Eaters could be the antagonists. Even though Voldemort is gone, there could be some who still hold a grudge against Harry and want to finish what their master started. They might track Harry and Ginny down as they run away, creating dangerous situations for the couple.
Ron and Hermione could be main characters. They are Harry and Ginny's closest friends. Hermione might offer her vast knowledge of magic to help with any problems the baby has, like if there are some strange magical symptoms. Ron could be there for comical relief, making jokes about how Harry has become a proper family man now.
It could be someone completely new, an original character created for the fanfiction. Maybe a mysterious wizard who had a brief encounter with Ginny.
The obvious target audience would be Harry Potter fans, especially those who are interested in the relationship between Ginny and Harry. They would enjoy reading about Ginny expressing her feelings for Harry in the form of singing, as it adds a creative and unique aspect to their relationship.
Ron could be a side character. He might be hovering around, giving unwanted advice to both Harry and Ginny, since he is also a big fan of wizard chess. Hermione could also be there, rolling her eyes at Ron's antics and making some intelligent comments about the strategies Harry and Ginny are using. Maybe Neville could pop in too, just to watch the game and cheer them on in his own shy way.
They could also discuss the current situation in the wizarding world, like the threats from dark wizards or the new laws being implemented. Since Harry is often in the middle of these events, Ginny's brothers might want to hear his perspective and share their own thoughts on how to keep their family safe.