In addition to Percy and Annabeth, there could be the kids they are babysitting. These kids could be new characters created for the fanfic, or perhaps they could be the children of other known demigods. There's also a chance that some minor gods or goddesses could show up, either to cause trouble or to help out. For instance, Hermes could pop in to play a little trick on Percy and Annabeth, or Aphrodite could come to give some relationship advice to the two.
Obviously, Percy and Annabeth are the main characters. But we could also see some of their demigod friends like Grover. Grover might stop by to check on them and end up getting involved in the babysitting chaos. Maybe Chiron could also make an appearance, giving Percy and Annabeth some advice on how to handle the kids.
In this fanfic, Percy and Annabeth could face some challenges. For example, the babysitting job might be a part of a quest. The kids could be in danger from some mythical creatures. Percy and Annabeth would then have to protect them while also taking care of their basic needs. They might also teach the kids about Greek mythology and their own powers, which could be really interesting.
Obviously Percy himself. Also, Annabeth would probably be there as his girlfriend. Grover, his satyr friend, might also make an appearance. And the gods, like Poseidon, Percy's father, would surely play a role, either guiding Percy or testing him on his path to godhood.
Obviously, Percy himself would be the main character. Annabeth would most likely be there too, as she is an important part of Percy's life. Grover would also be a likely character, being Percy's best friend.
Obviously Percy himself. And likely his friends like Annabeth. She would probably play a role in either helping him adjust or trying to find a way to reverse the situation if Percy doesn't want to be a god.
The main characters are most likely Annabeth and Percy. Since Annabeth is the one who is pregnant, she would be a central figure. And Percy, being her partner, would play a crucial role in protecting her and the unborn child in Tartarus.
There might be some new characters introduced in the fanfiction who have different ideals or motives that clash with Annabeth's. These new characters could be the antagonists as they oppose Annabeth, and Percy has to step in. For example, if they think Annabeth's way of handling a certain quest is wrong and Percy believes in her, he'll fight against their ideas.
The gorgons could be a likely villain. They might be lurking in the catacombs of Paris, waiting to turn Percy and Annabeth into stone. They could be after some powerful magic item that is hidden in the city.
Well, they might have a lot of fun. Percy could use his water powers to create little water fountains for Estelle to play with in a safe way. Annabeth would probably be the more organized one, making sure Estelle eats her snacks on time and takes a proper nap. Maybe they'd tell her stories about their adventures, like the time they fought monsters. And Estelle would be in awe of them, looking up to them as these amazing heroes.
Aphrodite could also be one of the spying gods. Since she loves meddling in love affairs, and Percy and Annabeth's relationship is quite famous among the demigods. She might be spying to see how their relationship develops and perhaps add a little nudge here and there if she feels like it.
Well, there could be new characters created specifically for this fanfiction. For instance, Chaos might have his own loyal servants or minions who interact with Percy. There could also be other heroes or demigods from different pantheons. They might come to Percy for help or to challenge him. And of course, Percy's mother, Sally. She might be worried about her son and try to reach out to him, even though he is now in the realm of Chaos. Her presence could add an emotional aspect to the story as Percy has to balance his new life with his love for his mother.