Often, other Decepticons like Starscream might be involved. Starscream, always vying for power, might see Megatron's condition as an opportunity to finally take over. So he could play a major role in the fanfiction, either causing trouble or having a change of heart. And then there could be some human characters who get caught up in the events, perhaps scientists or soldiers who are trying to understand what's going on with Megatron.
Some fanfictions might include other Autobots too. For example, Bumblebee. He could be the one who represents the more empathetic side of the Autobots towards Megatron's situation. Or Ratchet, the medic of the Autobots, who might be forced to help Megatron due to some unforeseen circumstances. And of course, there could be new, original characters created just for the fanfiction to add more depth to the story.
For a 'rwby megatron fanfiction', Ozpin could be a main character. He has a lot of knowledge and could potentially figure out a way to deal with Megatron. The RWBY girls would also be main characters as they are the heroes of their world. Megatron would be the main antagonist, driving the conflict in the story with his desire for power and domination.
Well, obviously Megatron is a main character. In his human form, he's the center of the story. Often, there will be some human characters as well. Maybe a scientist who was involved in the process that turned him human, or a normal person who becomes his friend or ally.
Well, obviously Gaster is the central character as it's about his pregnancy. But often, other characters from the same fictional world might be involved. For instance, characters who are friends or colleagues of Gaster could be there to support or oppose the situation. It might also include characters who have some sort of special connection to Gaster's unborn child, like a potential mentor or an enemy who wants to harm the baby.
Well, Megatron would probably be conflicted. On one hand, he's a powerful leader and this unexpected situation might make him feel like his authority is being challenged in a strange way. Starscream, on the other hand, would be in a vulnerable position yet also see an opportunity. He might try to manipulate Megatron with the pregnancy. Other Decepticons would likely gossip and some might try to take advantage of the situation to undermine both Starscream and Megatron.
Ron could also be there. He might be in charge of something like the Gryffindor Quidditch team or be a part - time teacher teaching the younger students about the magical history of the Weasley family's inventions. His humor and loyalty would be a great addition to the story.
In many 'Stiles is not human fanfiction', Malia could play a significant role. Given her own complex backstory and her were - coyote nature, she might be able to relate to Stiles in some ways if he's not human. She could either help him adapt to his new state or be in conflict with him. Kira could also be involved. Her kitsune powers and her kind nature might lead her to try and understand Stiles. And the Sheriff, Stiles' father, is bound to be in the story. His relationship with Stiles would be put to the test as he discovers his son is not what he thought he was, and he'd have to deal with his own emotions and the potential danger that Stiles' non - human nature could bring.
Kristoff is often involved. He would be there to support Anna, and might be a bit nervous about becoming a father. Olaf could also be a popular character in such fanfictions. He'd be his usual cheery self, trying to make the pregnant Anna and Elsa happy with his funny remarks.
Obviously, Quinn is a main character as she is the one who is pregnant. Finn might also be heavily involved as he was Quinn's boyfriend in the show and could play different roles in the fanfiction, like being a supportive partner or facing difficulties in dealing with the pregnancy.
Gale Hawthorne might also be involved. Since he has a complex relationship with Katniss in the original story, his reaction to Katniss's pregnancy could be an important part of the fanfiction. He might have feelings of jealousy or regret, or he could be a supportive friend in a different way.
Yoda would be another character. As one of the wisest Jedi, he could sense the strange situation with Anakin and offer his unique perspective. He might be more patient with a child - like Anakin, teaching him important Jedi lessons and trying to ensure that Anakin doesn't go down the same dark path as he did in the original timeline.