Obviously, Clary herself is central. Then there's Jace, her love interest. He would be very involved, probably being there for her throughout the pregnancy and during the birth. Simon might also be there. As Clary's best friend, he would offer his support in his own way, perhaps with some comical moments to lighten the mood.
Alec and Magnus could be involved too. Alec as a fellow Shadowhunter and Magnus with his magic could provide some help or protection. Maybe Magnus uses his magic to ease Clary's pain during childbirth. Isabelle would also likely be around, being Clary's friend and a strong female presence.
There could also be some new or minor characters introduced in the fanfiction. For example, a midwife who is also a part of the Shadowhunter world, or an elder who has some special knowledge about childbirth among Shadowhunters. Their presence could add more depth and variety to the story.
Obviously, Shikadai's parents would be central characters. His mother would be going through the process of pregnancy and childbirth, and his father would be there for support. Also, the medical staff or midwives in their world would be involved, taking care of the mother and baby during the birth.
Clary is the central figure. Valentine might also be involved in some fanfictions, either as an obstacle trying to prevent Clary from getting her memories back because he doesn't want her to discover certain secrets, or in a more complex way where his past actions are somehow related to the loss of her memories in the first place. And of course, the Lightwood family members are likely to be involved, given their importance in Clary's life and the Shadowhunter community.
Obviously, Harry Potter himself is the central character as he is the one going through the pregnancy. The Weasley family, especially Molly Weasley, would be involved as the Burrow is their home. Ron and Hermione, being Harry's closest friends, are also likely to be part of the story. Ginny Weasley might also play a significant role, considering her relationship with Harry.
Obviously, Clary herself is the most important character as she's the one giving birth. Her partner would also be crucial, providing support and sharing the joy of the new arrival.
One popular storyline could be Clary's struggle during childbirth. Maybe there are complications, and the other characters in the 'Shadowhunters' world have to come together to support her. For example, Jace could be by her side, freaking out but trying to be strong for her.
Padme herself is obviously a main character. She is the one giving birth after all. Her baby, which could be Luke or Leia in the Star Wars context, is also an important part, even if not fully developed yet at the time of birth.
Ron is often involved. He's Hermione's husband in many fanfictions, so he'd be there to support her during the birth. Harry might also be present, as he's their close friend. He could be the one to ensure their safety during this vulnerable time. Ginny could be another character, perhaps helping Hermione through the labor process, offering her the kind of female support that's important in such a situation.
Another possible character could be a secret supporter of Anne Boleyn. This person might be trying to find a way to get word out about her situation or even plan an escape for her and the new - born child. It could add an element of intrigue and hope to the otherwise very bleak scenario of her giving birth in the tower.
Well, it could be about the challenges Clary faces during childbirth, like her fear and the support she gets from her friends. Maybe her partner is by her side, holding her hand through the pain.
Well, often it's Clary, Jace, and Simon. Simon is Clary's best friend, and in some fanfictions, his relationship with Clary can make Jace a bit jealous, but at the same time, if Simon seems too friendly with another girl, Clary might also get jealous in a different way. It's an interesting triangle - like situation that can add a lot of drama to the fanfiction. And of course, Magnus Bane might also make an appearance and his flamboyant personality could somehow be involved in situations that lead to Clary's jealousy.