One possible plot could be Dumbledore taking Harry on a magical tour of Hogwarts. He shows Harry secret passages and tells him stories about the founders. For example, they could visit the Room of Requirement together and Dumbledore could explain how it works. This would not only be an educational experience for Harry but also a chance for Dumbledore to bond with him on a more personal level.
A plot could involve Dumbledore babysitting a very young Harry. He could introduce Harry to magical creatures in a gentle and safe way. For instance, he might bring a baby unicorn to the Gryffindor common room for Harry to see. Dumbledore would tell Harry all about the unicorn's significance in the wizarding world, and how to approach it. This would be a magical and heartwarming experience for Harry.
Hagrid could be a great supporting character. He could bring some interesting magical creatures for Dumbledore and Harry to interact with. For example, he might bring a baby dragon that Dumbledore could use to teach Harry about the care and danger of such powerful creatures.
In such a fanfiction, perhaps a major plot point is how Dumbledore trains Harry to face a new and greater threat. It could be a dark wizard more powerful than Voldemort, and Harry has to learn a whole new set of strategies and magic under Dumbledore's guidance. Harry might also develop a deeper understanding of the wizarding world's history and secrets through Dumbledore's teachings, which could be a key part of the plot.
Well, perhaps there's a fanfic where Dumbledore travels to the Muggle world for some reason and stumbles upon a baseball game. He gets hold of a baseball bat and realizes it has some interesting properties. Back at Hogwarts, he uses magic to enhance the bat and it becomes a sort of magical weapon that can be used against dark forces. Maybe it has the power to deflect dark spells or even send out bursts of positive energy. And the students are both amused and amazed by this new addition to Dumbledore's arsenal.
One possible reason could be a misunderstanding. Maybe Harry is led to believe that Dumbledore has been hiding something crucial about his parents' death or Voldemort's return. For example, if Harry discovers some encrypted files in Dumbledore's office that seem to suggest Dumbledore had a prior deal with Voldemort, it could lead to a fight. Another aspect could be related to power. If Harry feels that Dumbledore is being too controlling over his actions and the use of his powers, he might lash out. In the wizarding world, power struggles are not uncommon, and Harry, as a powerful wizard in his own right, might want to assert his independence.
In most official 'Harry Potter' works, Harry would never shoot Dumbledore. So in a fanfic, this is a very dark and out - of - character plot. Maybe the most shocking part is that it completely subverts the relationship between the two in the original story. It challenges readers' understanding of the characters' natures and their bond.
A really interesting plot could be that Ariana's spirit is trapped in a limbo of sorts. Harry, with his penchant for getting into extraordinary situations, discovers a way to communicate with her. They then work together to free her spirit. Along the way, Harry learns more about Dumbledore's past through Ariana's memories, which in turn helps him in his own battles against the remaining dark forces in the wizarding world.
One possible plot could be a wizard accidentally stumbles upon a Devil Fruit while on an adventure in a far - off land. He eats it and gains the power, say, of the Gomu Gomu no Mi (Rubber - Rubber Fruit). Then he has to hide this new power from his Hogwarts friends and teachers at first because he's not sure how they'll react. As he gets used to the power, he starts using it to his advantage in Quidditch, like stretching his arms to catch the Snitch from a great distance. But then dark forces in the wizarding world become interested in his unique power and he has to fight them off with a combination of his wizardry and Devil Fruit ability.
In this fanfic, Dumbledore might de - age Harry to give him a second chance at childhood. Harry had a tough childhood, and Dumbledore could think that by de - aging him, he can give Harry a chance to experience a more normal and happy childhood. This would lead to a lot of character development as Harry would have to deal with his past traumas while being in a child's body, and he might also discover new things about his magic along the way.
In some fanfics, Dumbledore's Army could be involved in secret missions outside of Hogwarts. For example, they might go on a quest to find a hidden magical artifact that could help in the fight against Voldemort. This would add an element of adventure and mystery to the story.
Another plot could be the apprentice getting involved in a time - traveling adventure. They might travel back in time to witness key events in the wizarding world's history, like the founding of Hogwarts. Along the way, they could accidentally change something in the past, and then have to find a way to fix it before it causes chaos in the present.