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.
Dumbledore can also be a significant character. He might be the one who decides Harry's punishment or he could be the one to offer some wisdom to Harry during his time of being grounded. And of course, the teachers like Snape or McGonagall could be involved as they are often the ones who enforce the rules and punishments at Hogwarts.
Well, of course, Caillou himself is the central character. His parents also play important roles as they are the ones who ground him and teach him lessons.
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.
Obviously, Seto himself would be the main character. He is the one who is getting grounded, so the whole story would revolve around him. His family members could also be important characters. For example, his parents or guardians who are the ones grounding him. They would play a role in setting the rules and enforcing the grounding. His friends might also be characters in the story. They could come to visit him while he is grounded or try to convince his guardians to let him go early.
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 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.
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.
A common theme is Arthur learning a lesson. When he gets grounded, it's usually because he did something wrong, like lying or being disobedient. Through the experience of being grounded, he grows as a character.
Obviously, Harry Potter himself is the central figure. His friends like Ron and Hermione would also be involved. They would support Harry in his revenge plans, with Ron providing his loyalty and Hermione using her intelligence to strategize. Ginny Weasley might also be part of it, as she is Harry's love interest and a strong - willed witch in her own right.
The main character is Angelica. Then there are her parents, who play a crucial role in grounding her. Additionally, Susie could be a character in this fanfiction. She might be the 'good girl' contrast to Angelica. When Angelica is grounded, Susie could be having a great time with the other kids, which would make Angelica even more jealous and regretful of her actions that got her grounded.