There might also be a mentor - like character, perhaps an older Mudblood or a sympathetic teacher. This person could be Professor Snape (although in canon he was a half - blood, in fanfiction he could be reimagined as a Mudblood - ally). He could guide the younger Mudbloods through the difficulties at Hogwarts and help them find their place in the wizarding community.
Perhaps a story where Mudbloods at Hogwarts start a secret club to support each other. They could share their experiences of dealing with the prejudice, study magic together in unique ways, and eventually gain recognition for their contributions to the school. This would show their strength and unity in the face of adversity.
Maybe there's also an old Hogwarts professor who has some knowledge about the phantom's existence. This professor could play a crucial role in guiding the students or trying to solve the mystery related to the phantom.
In addition to Harry and the Dursleys, there could be some Hogwarts professors involved. For example, Professor Dumbledore might play a role. He could be the one who arranges for some sort of exchange or interaction between Hogwarts and the Dursleys. Also, Hermione and Ron could be main characters if they accompany Harry to meet the Dursleys or are involved in the events that bring Hogwarts to the Dursleys' doorstep.
It's likely that the main characters would be the well - known Hogwarts students like Harry Potter, Hermione Granger, and Ron Weasley. Since they are central to the Hogwarts experience, they would probably be the ones reading the fan - fictions.
Dumbledore could also be a major character. As the headmaster of Hogwarts, he has a big influence on Harry's life at the school. And maybe some of the Hogwarts ghosts like Nearly Headless Nick would play significant roles in the story as well.
It's possible that some of the Hogwarts professors, such as Professor Dumbledore or Professor McGonagall, are main characters. Dumbledore with his vast knowledge of magic and McGonagall with her no - nonsense attitude. They could be guiding the students in their investigations of the graveyard or trying to keep them safe from any potential threats.
There could be a character like Tom, a Smeltings student who is very disciplined but curious about the magical world of Hogwarts. He might be the main character who drives the story forward as he experiences all the new things at Hogwarts.
The main characters in 'hogwarts baby project fanfiction' might be the ones in charge of the project at Hogwarts. This could be a wise old professor who has a special interest in the magical development of babies. There could also be a group of young students who volunteer or are chosen to assist in the project. They would be the ones facing the challenges and having the adventures related to the baby project.
Since it's about Harry as a mediwizard at Hogwarts, Harry is the central character for sure. In addition, I would expect to see characters like Neville, who could be someone Harry helps as a mediwizard. And then there could be some new characters created specifically for this fanfiction, perhaps other mediwizards in training with Harry or patients with really strange magical conditions that he has to deal with.
Harry is the central figure. But there could be new characters introduced as students or staff. For example, the children of the original characters could be main characters in their own right. Ginny Weasley, Harry's wife, might also be prominently featured, perhaps as the Quidditch coach or in charge of some other aspect of school life. Additionally, old professors like McGonagall could still be around and be important characters.