Well, Harry's friends like Ron and Hermione would also change in their reactions. Ron might be a bit more protective of his sister Ginny and try to help Harry in any way he can. Hermione would probably be the one giving all kinds of advice on pregnancy and parenting, showing her intelligent and practical side more.
Harry would likely become more responsible and mature. The news of Fleur being pregnant would force him out of his comfort zone and make him think about the future in a more serious way. Fleur would also change, she might become more protective and nurturing. Her Veela side might also come out more in terms of being possessive of Harry and the unborn child.
For Harry, his focus would shift from just fighting Voldemort or dealing with school stuff. He would be more concerned about providing for Daphne and the baby. Daphne, who might have been a bit more reserved before, could become more outspoken as she has to fight for her relationship and the future of her child. They both would change their social circles too. Maybe they would be closer to those who support them and distance themselves from those who oppose their relationship.
Harry would experience a major shift in his character. He'd no longer be just the hero of the wizarding world but also a soon - to - be father. This would make him more cautious and calculating in his actions. He might also become more protective of Gabrielle. Gabrielle would change in that she would have to deal with the physical and emotional changes of pregnancy. She'd become more self - aware and perhaps more assertive in ensuring her and the baby's well - being. Her relationship with Harry would also change as they navigate this new chapter of their lives together.
In this kind of fanfic, perhaps they would have to deal with the reactions of their friends and family. Some might be overjoyed while others could be concerned about how this will affect their lives, especially considering Harry's role in the wizarding world. Ginny, on the other hand, would be determined to have a normal pregnancy despite all the attention.
Ron could develop a deeper understanding of Ginny. He may realize how strong she is, especially when dealing with the physical and emotional changes during pregnancy. Ginny might also see Ron in a new light, as he steps up to support her. He could start taking on more jobs around the house or helping her with her daily tasks. This would strengthen their relationship and help them both grow as individuals.
Their friends would be in shock. Ron, being Harry's best friend and Ginny's brother, would be torn between loyalty to both. Hermione would probably be disappointed in Ginny and very supportive of Harry. The Weasley family as a whole would be divided. Mrs. Weasley, who loves Harry like a son, would be heartbroken and angry at Ginny. Their other friends at Hogwarts or in the Order of the Phoenix would likely gossip and have mixed feelings. Some might pity Ginny for the difficult situation she got herself into, but also condemn her for cheating on Harry.
Often, they would rely on the love they have for each other. Ginny, being a strong - willed witch, would be determined to have a healthy pregnancy. Harry, with his sense of responsibility, would start looking into ways to provide for the family. Maybe he'd take on more dangerous tasks for higher rewards initially, but Ginny would convince him to be more cautious for the sake of their unborn child.
Harry would likely become more responsible and protective. He'd have to grow up quickly to face the situation. Lily, on the other hand, might become more assertive in her decisions regarding the pregnancy and their future.
The main characters are clearly Harry and Susan. Harry is the one who gets Susan pregnant, so he's likely to be a central figure in the story as he has to deal with the consequences of his actions. Susan, being the one who is pregnant, will also be a main character as she has to go through the physical and emotional changes that come with pregnancy.
It would become much more serious and committed. They'd have to rely on each other more than ever.