Well, Percy is surely one of the main characters since it's about his memories. His friends like Annabeth might also be important, as they are likely to be part of his memories.
One interesting aspect could be the exploration of Percy's past experiences that were not fully covered in the original work. For example, his early days of training might be delved into more deeply.
In a fanfiction of Thalia's memories as a guardian, it could explore her relationship with other characters like Percy. Maybe she has memories of when Percy first arrived at the camp and she was initially wary of him. But as time passed, she saw his potential and they became comrades. These memories could shape how she continues to protect the camp and those in it.
The theme of growth and change is prevalent too. Percy's memories can cause him to change his perspective, his relationships, and his goals. It's like his memories are a catalyst for his personal development in these fanfictions.
Thalia's memories as a guardian might include the time she patrolled the borders of Camp Half - Blood alone at night. The moon shining above her as she was on high alert for any signs of danger. This could be a really cool scene in a fanfiction.
There's also 'Memories of Percy: A New Beginning'. This fanfiction focuses on Percy's memories being used to rewrite his future in a different way. It's full of twists and turns that keep you hooked from start to finish.
Fanfiction about Madara's memories can also focus on his relationship with Hashirama. We often see in these stories how their friendship was initially pure but then got torn apart by the political situation. This can give us new perspectives on the whole ninja world's history and how the two most powerful shinobi of their time had different views on peace.
One interesting aspect of Naruto's childhood in fanfiction could be his relationship with Iruka -sensei. In many fanfictions, they have deeper emotional bonds that are explored more in -depth than in the original series. Iruka was like a father figure to Naruto when he had no one else, and fanfictions might expand on how this relationship influenced Naruto's growth during his childhood.
The teachers would probably be very interested. For instance, Professor McGonagall might want to see Hermione's memories to understand her learning process better, so she can use that knowledge to teach other students more effectively. Also, Harry and Ron would be interested. They are her closest friends, and seeing her memories could give them a deeper understanding of her and their shared adventures.
Well, the fanfiction could explore it in a very emotional way. Minato's memories might be filled with his hopes and dreams for Naruto. As Naruto delves into these memories, he could find out about the sacrifices Minato made for the village and for him. This would not only strengthen Naruto's bond with his father's legacy but also fuel his determination to protect the village and fulfill Minato's unfulfilled wishes.