Magnus Bane could be involved. He has knowledge of both the magical and vampire worlds, so he could offer advice or help. Clary Fray might also be there, as Isabelle's friend, she would be supportive during the pregnancy. And of course, Simon, who has his own connections to the vampire world through Raphael.
One idea could be that they initially struggle with the news. Raphael might be worried about protecting Isabelle during her pregnancy. Maybe they face challenges from the vampire or shadowhunter community. Another could be that they discover some unique powers or prophecies related to their unborn child.
Well, Ron is a given. He's Hermione's significant other, so he'd be deeply involved in the whole process. Luna Lovegood might also make an appearance. She has an unique perspective and could bring some calmness and different kind of support. And don't forget about Hagrid. He has a big heart and might come to offer his congratulations and well - wishes in his own, endearing way.
Other characters like Ginny Weasley could be part of 'hermione fails' fanfiction. Ginny might be Hermione's confidante when she fails in a relationship, offering advice based on her own experiences. Neville Longbottom could also be involved. He could be in a situation where Hermione fails to recognize his potential or she fails to help him when he needs it most. And of course, the Weasley twins, Fred and George, could be involved. They might use Hermione's failure as inspiration for one of their pranks or they could be the ones to cheer her up in a humorous way after she fails something important.
Harry Potter is a very likely character. Given his often - tense relationship with Snape, detention with Snape could be a great opportunity to explore their dynamic further. Harry might learn more about Snape's motives during these detentions, or they could have some unexpected conversations that change Harry's perception of Snape.
Sasuke could be involved. Since they have a complex relationship, Sasuke might either be a rival during Naruto's training, pushing him to be better, or he could end up joining Naruto in some training sessions to become stronger together.
Definitely Ash, as he's the center of Serena's affections. But also, there could be new female characters created specifically for the fanfiction. These new characters might be trainers who are really good at Pokemon battles and catch Ash's attention. Serena would then become jealous of their skills and the attention Ash gives them. Additionally, any of Ash's Pokemon that seem to have a special connection with another character could also be part of the scenario that makes Serena jealous. For example, if Pikachu seems to like a new girl more than Serena, that could be a reason for her jealousy.
Papyrus could be involved. He might be trying to convince Undyne to find a peaceful solution or he could be on her side and help in the war effort in his own way.
The Lone Wanderer is likely to be involved. They have a pre - existing relationship with Amata from the game. Her father, the Overseer, might also play a role, either in supporting or opposing the situation. Other characters from Megaton or Tenpenny Tower could potentially be involved as well.
Sasuke is an obvious choice. He has a connection to Naruto that goes beyond just friendship or rivalry. He might be the one who first discovers Naruto's predicament and sets out to find a solution. Sakura is essential too. Her skills as a medical ninja are crucial. She could be the one who patches Naruto up every time he gets injured in his fight against whatever is threatening his life. Also, characters like Jiraiya might make an appearance. Even though he's dead in the original story, in this fanfiction, he could come back as a spirit guide to help Naruto find a way to 'refuse to die', giving him advice based on his own knowledge and experiences.
Finn could be involved if the fanfiction wants to explore a relationship with him as the possible father. He was an important part of Rachel's life in the original series, and his reaction to the news would be significant.