It could be a new teacher at Hogwarts who is strong in magic and very smart academically. They don't like Dumbledore's leadership style. They think Dumbledore is too lenient with some students and too strict with others. This teacher might start implementing their own rules in the classroom which go against Dumbledore's general ethos. They could also form a group of like - minded students who also have some issues with Dumbledore, and together they try to bring about a change in the way Hogwarts is run.
Perhaps the character is a disillusioned wizard from outside Hogwarts. They were once in awe of Dumbledore but after learning some of the darker aspects of the wizarding world that Dumbledore seems to tolerate, they turn against him. This strong and smart character could be trying to expose what they believe are Dumbledore's flaws. They might use their intelligence to dig up old secrets about Dumbledore's youth or his relationships with other powerful wizards. And with their strength, they are not afraid to face the opposition that comes with challenging such a revered figure.
One possibility is that the character might be a Slytherin student who has his own ideas about power and knowledge. They could see Dumbledore's actions as being too self - righteous. This character, being strong and smart, might try to undermine Dumbledore's influence within the school. They could start by spreading rumors about Dumbledore's past decisions that they think were wrong. For example, they might question Dumbledore's handling of the Chamber of Secrets incident, believing that Dumbledore should have been more proactive in preventing it rather than just reacting after the fact.
I'm not sure of a specific fanfic with this exact premise off the top of my head. However, you can try searching on fanfic websites like Archive of Our Own or Fanfiction.net. Use keywords like 'Harry Potter', 'Strong Smart Character', 'Anti - Dumbledore'. There are thousands of fanfics out there, and you're likely to find one that fits this description.
It could be that Harry finds out about Dumbledore's secrets regarding the Deathly Hallows. If Harry thinks Dumbledore was more interested in the Hallows for his own purposes rather than for the greater good, it might make him hate Dumbledore.
Well, it could be that Harry discovers some dark secrets about Dumbledore's past actions. Maybe Dumbledore made a deal with some dark forces long ago that Harry thinks endangers the wizarding world. So, in a fit of moral outrage, Harry decides to 'sack' him, which could mean removing him from his position of power and influence at Hogwarts.
One reason is that fans like to explore different perspectives. In the original books, Dumbledore is presented as a wise and mostly benevolent figure. But some fans want to see what would happen if he had a darker side. It adds a new layer of complexity to the story.
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.
One possible reason could be that Harry breaks school rules in the fanfiction. For example, if he ventures into the Forbidden Forest without permission. Dumbledore is strict about the safety of students and such disobedience might lead to punishment.
A 'Harry Potter in Ravenclaw' smart fanfic could be really interesting. In this scenario, Harry would be more focused on knowledge and intellectual pursuits. He might spend a lot of time in the Ravenclaw common room, surrounded by books and students eager to debate and learn. His friends could be those who value intelligence and wisdom, and they would likely have deep discussions about magic theory and the history of the wizarding world.
It could be a fan - made fiction related to Harry Potter that is 'smart' in the sense of having intelligent plotlines, well - developed characters, or perhaps complex magical concepts. Maybe it's a fanfic that cleverly weaves in different elements from the original series in new and unexpected ways.
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.