They would become more protective of each other. Ron would be more vigilant about Hermione's well - being as she is now the mother of their child. And Hermione would be more understanding of Ron's insecurities as a new father.
One possible plot could be the challenges they face as new parents. Maybe they struggle to balance their duties at the Ministry (assuming they work there) with taking care of the baby. For example, they might have to deal with sleepless nights and still be on top of their work.
The baby's existence could also have a unifying effect. Given that Hermione is a Muggle - born and Ron is a pure - blood, their family represents a combination of different wizarding backgrounds. Their baby could be a symbol of unity, inspiring other wizards and witches to look beyond blood status differences and work together more harmoniously.
One possible story could be about the challenges they face as new parents. Maybe the baby has some unique magical abilities that they have to figure out how to handle. For example, the baby might accidentally make objects levitate when it gets excited, and Hermione and Ron have to find a way to teach it control in a loving yet firm way.
Well, Harry Potter is often included. He's their best friend, so it makes sense that he would be around to help out with the baby. Maybe he becomes the baby's godfather and is always there to offer advice or protection. Another common character could be Ginny Weasley. As Ron's sister, she would likely be very involved in the baby's life, perhaps babysitting or helping Hermione with motherly advice since she has her own children in the original story.
In a 'Ron and Hermione baby Hugo fanfiction', perhaps Hugo has an uncanny ability to communicate with magical creatures. Ron takes him to the Weasley's garden where he seems to be having a full - on conversation with the gnomes. Hermione is initially skeptical but soon realizes Hugo has a special gift. They then decide to take Hugo on trips to different magical habitats to further explore his talent.
One possible plot twist could be that they face unexpected magical difficulties. For example, a spell gone wrong might temporarily affect their chances of having a baby. Maybe a dark magic remnant in their house, left over from their previous battles, starts to interfere with the natural process. Another twist could be that they discover a long - lost family curse that might be passed on to their potential child. This could lead them on a journey to find a cure before they actually conceive.
Well, Hagrid would be extremely happy for them. He might offer to take the baby on rides on his back when it's old enough. He would also give them some really large and warm hugs of congratulations. Cho might be a bit more reserved in her reaction, but still polite and happy for them. She might offer some advice on how to balance a family life with their wizarding duties. And the Hogwarts professors, like McGonagall, would probably send them well - wishes. McGonagall might even offer some special tutoring for the future child if it shows magical aptitude early on.
Obviously, Ron and Hermione are the main characters as the baby's parents. Their personalities play a big role. Ron's humor and Hermione's intelligence are often passed on to the baby in different ways in the stories. Also, Harry Potter sometimes makes an appearance as the baby's godfather or just as a close family friend.