One possibility is that Harry discovers some new magical abilities during this summer of depression. It could be something that helps him better understand his connection to Voldemort or gives him an edge in the upcoming battles. Or, he might meet some unexpected allies, like a local wizard who has been observing him secretly and decides to offer some guidance or training to help him through this tough time.
In this fanfiction, Harry might be dealing with the aftermath of the Triwizard Tournament. He could be depressed due to the loss of Cedric, the return of Voldemort, and the general disbelief from the wizarding world. Maybe he isolates himself at the Dursleys' during the summer, constantly reliving the traumatic events in his mind.
He could start to explore the secrets of his parents' past more deeply. Since he's feeling so down, he might look for some kind of comfort or understanding in their history. This could lead him to discover new things about his family that give him strength.
Well, in some fanfictions, Snape might start to see Harry in a different light. Maybe he begins to teach Harry some advanced potions techniques secretly during the summer. He could also grudgingly share some of his knowledge about the Dark Arts in a more controlled way, just to make sure Harry is well - equipped to face future threats.
Well, one possibility is that Snape could start to see Harry in a new light. Maybe he discovers Harry's hidden talents or interests during the summer. For example, Harry might show an aptitude for potions that Snape had previously overlooked.
Well, he might try to change certain events. For example, he could prevent Cedric from entering the Triwizard Tournament, thus avoiding his tragic death. He might also use his knowledge of future events to outwit Voldemort earlier.
There might be a fanfiction where in their fourth year, Harry and Hermione go on a secret adventure related to the Dark Arts that they suspect is connected to Voldemort's return. Along the way, they face many challenges and have to rely on each other's strengths. Hermione's knowledge of spells and Harry's courage are put to the test, and this experience brings them closer together as friends and perhaps something more.
He might face challenges similar to what Harry did. Maybe he has to deal with a bully who mocks his parents' fame. Just like Harry had Draco, his son could have someone who gives him a hard time right from the start.
Maybe Harry could meet new friends while training. He might discover new magical abilities related to his training. Or he could face some challenges that test his limits.
One thing that could occur in the 'Harry Potter 4th Summer Fanfic' is that Harry is being trained by some of the older students or even a teacher in secret. This training could be related to combat skills or ways to deal with dark magic. He might also be researching about the history of the Triwizard Tournament in the library at Hogwarts, which he has sneaked into. He could discover some dark secrets about the tournament's past that might put him in a better position to face the challenges ahead.
In 'Harry and Daphne 8th year fanfiction', they might start as unlikely friends. Harry could show Daphne a different side of the wizarding world she never knew. For example, he could introduce her to the Weasleys and their unique family dynamic, which would be a big contrast to her pure - blood family upbringing.
One possible plot could be that after the events of the fourth year, Harry discovers that some of his friends and allies are starting to doubt him because of the return of Voldemort. This makes him feel isolated. He might then start to focus more on self - study of magic, exploring hidden parts of Hogwarts on his own.