In many 'Ash was adopted' fanfictions, Nurse Joy and Officer Jenny can be involved. They might be the ones who help facilitate the adoption process. Professor Oak could also be there, as he has always been a guiding figure in Ash's life. And there could be rival trainers who react differently to Ash's new family status, some seeing it as a weakness and others seeing it as an opportunity for Ash to grow even more.
Often, in these fanfictions, the adoptive parents are important characters. They could be experienced trainers or have some special connection to the Pokémon world. Gary Oak might also make an appearance, perhaps being jealous or curious about Ash's new family situation. And there could be new characters created specifically for the fanfiction, like the caretaker at the adoption agency or other adopted kids in Ash's new family.
One common character is of course Ash himself. Another could be Pikachu, as it is Ash's most loyal Pokémon. There might also be Misty or Brock, as they are Ash's long - time friends and could play a role in the adoption story, either being supportive or having doubts about the new situation.
Often, the main character is the one adopted by God, of course. There might also be angels as supporting characters. They could be the ones guiding or protecting the adopted human. Another common character could be the devil or some sort of evil entity that tries to tempt the main character away from their path with God.
Obviously, Harry Potter himself is a central character. Hermione and Ron might also play important roles. They could be trying to figure out what happened to Harry and how to reverse the deaging. Dumbledore might also be involved, perhaps guiding the situation from the shadows or trying to protect Harry in his new situation.
Obviously, Willy Wonka is a common character. He's the one who adopts the protagonist. The Oompa - Loompas are also common. They might play different roles, sometimes as helpers, other times as a bit of an obstacle for the adopted character. And of course, the main character who is adopted by Wonka is always there.
Well, of course, Percy Jackson himself often makes an appearance. He could be a mentor figure to the adopted son, guiding him through the ropes of being a demigod. Annabeth is also common, perhaps helping the adopted son with her wisdom and knowledge of the mythological world.
Ron could also be there. He might be a bit jealous at first if Harry's adopted family is wealthier or has more influence in the wizarding world. But later, he would support Harry as always.
Harry Potter himself can be a common character in such fanfiction. Maybe in these stories, he has an adopted sibling or a new family member through adoption, which changes the dynamics of his relationships. For example, if he has an adopted Muggle - born sister, he might have to protect her more fiercely from the Death Eaters.
Obviously, Ash is a common character. His friends like Brock and Misty might also make appearances. They could offer their own skills and knowledge to help Ash in his ranger adventures.
Some fanfictions might also include new characters that Ash meets on his return journey. These could be trainers with unique Pokemon or mysterious characters who have a connection to the events that led to Ash's return. For example, a young trainer who idolizes Ash and wants to learn from him, or a character who has information about a powerful Pokemon that Ash is interested in.
Obviously, Ash is a central character since it's about him vomiting. Pikachu is likely to be there too, probably looking worried about Ash. Maybe Misty would be in the story as well, scolding Ash for getting into a situation that made him vomit or trying to take care of him.
Ash is obviously a very common character as the title includes his name. Pikachu, his trusty partner, is also likely to be there. His friends like Brock and Misty often appear as well. They might support Ash during his league journey or have their own sub - plots related to the league.