He would probably be quite amused by some of his past antics. For example, his constant pranks on Iruka-sensei. But at the same time, he'd also see the pain he carried from not having his parents and realize how that influenced his actions. He might react with a bit of regret for some of the stupid things he did out of loneliness, but also be glad that those experiences made him who he is today.
Well, Spy x Family fanfiction can be really interesting. Some fanfictions might explore different relationships between the characters in more depth. For example, they could focus on the bond between Anya and Loid in a new situation that wasn't shown in the original manga or anime. It's also fun to see how authors play with the spy and assassin themes in unique ways.
One common plotline could be the OC being a new addition to Toman and catching Sano Manjiro's eye. Maybe they start off as friends, helping each other out in gang fights or dealing with the problems within the gang world. Another could be a more romantic plot where the OC has some sort of special ability or knowledge that Manjiro finds fascinating, leading to a deeper connection between them.
Involve the OC in the world of Sano Manjiro in a natural way. Don't just have her appear out of nowhere. For instance, if she's a new student at their school, show how she gradually gets to know the members of Toman. Let her have her own relationships with other characters besides Manjiro. This way, she becomes a more integral part of the story and seems more believable.
Well, some past gods might be amused. They'd see these modern interpretations of their stories and characters in the Percy Jackson fanfiction as a strange yet interesting new form of worship or at least attention. For example, Zeus might be a bit irked at some of the liberties taken with his character, but also secretly flattered that people are still so interested in him.
Captain America would probably be very reflective. He might see his past self as a reminder of his long journey and how much he has changed. He could try to offer some words of wisdom to his younger self.
If it's an accidental situation like seeing a family member briefly without clothes in a non - sexual context, it's important to respect their privacy immediately. You could quickly look away and give them space to cover up. For example, if you accidentally walked in on a sibling changing, just say sorry and leave the room right away.
Ginny, who has a special relationship with Harry, would be heartbroken. She might initially be in denial and then turn to sadness. She could also be a bit angry that Harry didn't trust her or the family enough to stay and work through whatever problems he was facing.