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.
Perhaps Seto got into a fight with a powerful enemy and in the process, he put others in danger. His guardians or the people in charge decide to ground him to teach him a lesson about responsibility. During his grounding, he could start to reflect on his actions and come up with new strategies to face his enemies. He might also discover new things about himself while being alone in his grounded state.
Maybe in the fanfiction, Caillou gets grounded for breaking his sister's favorite toy. He then spends his time grounded trying to fix it as a way to make amends, which shows his growth in taking responsibility for his actions.
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, Peter Tripp. He was known for that crazy long - stay - awake thing. He just kept himself from sleeping for such a long time. And it was really tough on him. He had all kinds of strange things happen to him like seeing things that weren't there. In the end, it was a big deal not just for him but also for people to learn about how important sleep is for our bodies and minds. Because look at what happened to him when he didn't sleep for so long.
In Peter Tripp's story, the most important part was his decision to break the awake - time record. As he continued without sleep, he began to hallucinate things like bugs crawling on him. His body also started to fail, like his body temperature changing erratically. After the whole thing, he had to work hard to get back to normal, which took a long time.
The length of the story in Grounded can vary depending on how you play and explore. But typically, it offers several hours of gameplay and story content.