Henry could also be a key supporting character. As Emma's son, he would be excited about having a new sibling. He might be involved in protecting the unborn child from any threats. Also, Regina could play a role. Despite her past differences with Emma, she could be there to offer her magic skills if needed, like helping with any magical complications during the pregnancy.
Snow White and David are often main supporting characters. They are Emma's parents, so they would be there to support her during the pregnancy. They might offer advice on parenting and how to deal with the challenges that come with it.
Belle could be another supporting character. Since she has a relationship with Hook through Rumpelstiltskin, she might offer her knowledge of magic or just be a friend to Emma during this time. And of course, the dwarves could be there too, maybe helping out with practical things like building a nursery or providing protection for the family.
The main characters are clearly Mr Gold and Emma. Mr Gold is likely to be a complex character with his own backstory and motives. He may have a mysterious or perhaps even a bit of a dark side.
One popular storyline could be about how they deal with the unexpected pregnancy in a world full of magic and danger. Maybe they have to protect the unborn child from villains who want to use its power. Another could be the emotional journey they go through, from shock to acceptance and finally to excitement for their new family.
One potential supporting character could be the Hogwarts professors. They may have different reactions to Harry's situation. Some might be more accepting and try to help, like Professor McGonagall who could use her Transfiguration skills to create things that are useful for Harry during his pregnancy. There could also be some characters from the Asgardian side, like Heimdall, who could be observing the situation from afar and may or may not choose to interfere depending on how he sees the future implications.
Obviously, Mal is the central character. But often, her friends or romantic partners can be important characters too. For example, if she has a significant other, they will play a big role in how she copes with the pregnancy.
Well, obviously Emma and Hook are main characters as the parents of the baby. Emma, with her strong magic and determination, and Hook with his swashbuckling charm and loyalty. The baby, of course, is also a central figure in the fanfiction, even if it might start as a newborn and grow throughout the story.
Ashley could be a good support. She has a strong personality and could help Emma stand up to any bullies or negative comments. And then there's Marco. He's very empathetic and could be there for Emma when she has doubts or fears. He might even help her pick out baby clothes or decorate the nursery, showing his support in a practical and fun way.
Max's best friend could be a great supporting character. She could offer emotional support to Max during the pregnancy, give her advice on how to deal with Nathan, and be there for her when she's feeling scared or uncertain.
The main characters are clearly Luke and Emma. They are the ones at the center of the story, especially with the focus on Emma being pregnant.
There may also be characters created specifically for the fanfiction, like a mean neighbor who is jealous of the adopted person's new life with Emma Watson. Or a kind teacher who helps the adopted person adjust to their new school. But at the heart of it, the relationship between Emma Watson and the adopted character is the central aspect of the story and they are the main characters.
Yes, there might be some available on various fanfiction websites. You can try searching on platforms like Archive of Our Own (AO3) or FanFiction.net. Just be sure to check the tags and ratings to find the kind of story you're interested in.