Well, obviously Vegeta is the main character. Bulma would likely be very involved as his partner. Goku might also play a role, perhaps being confused at first but then offering his support.
The other Saiyans like Nappa or Raditz could be part of the story in some flashbacks or if there's some Saiyan - related explanation for the pregnancy. And of course, the other Earth - bound friends like Krillin and Yamcha could be there to offer their reactions.
There could also be new characters introduced in the fanfiction. For example, a healer or a scientist who tries to understand Vegeta's unique situation and help him through the pregnancy.
Obviously Inuyasha himself is the central character in this type of fanfiction. Kagome is often involved as well. She might be the one to support Inuyasha through his pregnancy, given their close relationship. Sango could also be present, perhaps helping with practical matters like finding suitable food or shelter for Inuyasha during his pregnancy.
Often, there are characters from Astrid's community or group. If she's part of a team or a clan, her teammates or clan members will be involved. They might have different reactions, some being very protective and others being a bit skeptical about how her pregnancy will affect the group. There could also be an antagonist who might try to use her pregnancy against her in some way, adding conflict to the story.
Yes, in the vast world of fanfiction, there are all kinds of creative and out - of - the - box stories. Some fans like to explore unusual relationships and scenarios, so it's possible that there is such a fanfiction out there. However, it goes against the original canon of the Dragon Ball series in many ways.
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.
Obviously, Harry Potter himself is the central character. His friends like Ron Weasley and Hermione Granger are also often involved. They might try to visit him while he's grounded or come up with plans to get him out of being grounded. Dumbledore could also play a role, either as the one who enforces the grounding in some cases or as the one who might offer some wisdom to Harry during his time of confinement.
The other Hogwarts professors like McGonagall and Flitwick might be included. If Snape is getting revenge on students who misbehaved towards him, characters like Draco Malfoy or the Weasley twins could be part of the story. Draco might be involved if he had previously mocked Snape, and the Weasley twins could be targets if they had played pranks on Snape that he now wants to pay back.
Another character that could be involved is a healer or a Jedi master. If Mara Jade is having some complications during her pregnancy, a healer would be needed. And a Jedi master could offer guidance, especially if the unborn child is suspected to have some special connection to the Force. This could lead to interesting interactions and plot developments.
There could also be original characters created specifically for the fanfiction. For instance, a ghostly doctor who specializes in the unique circumstances of a half - ghost pregnancy. Or a new human friend who discovers Danny's situation by accident and has to decide whether to keep the secret or not. These characters can add new twists and turns to the story in the fanfiction.
Obviously, Harry Potter himself is the central character as he's the one getting the wish. Hermione and Ron are also commonly involved. They are Harry's best friends, so they would be there to support him or perhaps even influence his wish. Dumbledore also often shows up in these fanfictions. As the wise headmaster, he might guide Harry on how to use his wish wisely or warn him of the consequences.
If such fanfiction exists, one common theme might be the exploration of how the two characters' relationship would change. They are usually rivals in the original series, so this would be a major shift. Another could be the reaction of the other Z - Fighters to such an unexpected situation.