Edward could be an ordinary man living in a small town. He has always wanted a family of his own but couldn't find the right partner. So, he decides to adopt a child to start his own family unit.
He could be a character who has had a difficult past himself. After going through his own struggles, he wants to give a better life to a child. So, he adopts a child and tries to break the cycle of hardship. He uses his own experiences to guide the child and build a positive future for both of them.
Maybe Edward is a well - known figure in the community, like a respected doctor. He has seen the hardships of children without families in his line of work. This prompts him to adopt a child. He brings the child into his busy life, filled with hospital shifts and medical emergencies, but still manages to make time for the child's upbringing.
Perhaps Edward is a wealthy man in the fanfiction. He adopts a child from a difficult background. He uses his resources to give the child a good education, a loving home, and along the way, they both learn from each other. The child might teach Edward about innocence and new perspectives, while Edward provides stability and care.
It could be a character who is jealous of the relationship between Roy and Edward. Maybe someone who wanted to adopt Edward themselves or has a grudge against Roy for taking Edward in.
There could be a prison guard who takes an interest in Edward's case. This guard might be sympathetic and start to help Edward in small ways, like getting him access to a lawyer or better living conditions in jail.
It could be an orphaned wizard child from a family that was killed by Death Eaters. This would give Snape an added sense of responsibility as he might feel guilty for being associated with the Death Eaters in the past.
Definitely Edward and Bella themselves are still very popular. Their relationship and how they parent the child are often central to the stories. Also, the other members of the Cullen family like Alice. Alice might have premonitions about the child's future, which can add a lot of mystery and intrigue to the story.
Perhaps a mysterious stranger. This stranger could have some connection to the reason why Edward turned into a baby. And then there's Edward's pet dog. The dog might be confused at first but then becomes very protective of baby Edward, adding an interesting dynamic to the story.
A young girl who is also homeless might be another main character. She could teach Edward the ropes of surviving on the streets, like where to find the best places to get food donations or how to stay safe at night. And they could develop a special bond during their time together.
An enchantress could also be a love interest. She might offer Edward a solution to his heir problem through magic, but in return, she wants something from him. Their relationship could be a complex one of power, love, and mystery. Edward would have to navigate through her world of magic while also dealing with his own desires for an heir and the future of his kingdom.
One possible plot could be Roy teaching Edward about the ways of the world outside of his previous experiences. Maybe he shows him how to interact in a more social setting, like introducing him to new friends or taking him to different events in their community.
Another possibility could be a new character created specifically for the fanfiction. This new character might have unique abilities or a personality that attracts Edward in ways Bella didn't. For example, she could be a vampire from a different coven with a very different view on life and love, which makes Edward question his feelings for Bella and consider this new character as a potential mate.