Well, a common theme is the re - evaluation of Dumbledore's actions. Since he was such a powerful and influential figure in the original 'Harry Potter' series, in 'dumbledore gets owned' fanfictions, his actions are often put under the microscope. Also, the theme of betrayal can be common. It could be that characters he trusted turn against him, showing that his trust in others was perhaps misplaced. This can lead to his downfall in these fan - created stories.
I'm not sure which specific 'dumbledore gets owned fanfiction' is the best, but you can start your search on fanfiction platforms like Archive of Our Own. There, you can look for tags related to Dumbledore and stories where he is put in difficult situations. Just keep in mind that some fanfictions may deviate a lot from the original source material in terms of character portrayal.
There's also a chance that Dumbledore gets caught by a group of rogue magical creatures. For instance, if he was exploring an area that was supposed to be off - limits to wizards and the creatures there saw him as an intruder. They might not be as rational as wizards and could hold him captive without really understanding who he is.
The theme of disillusionment also often appears. Harry, who once idolized Dumbledore, now sees him in a new light. He realizes that Dumbledore is not the perfect mentor he once thought, and this realization leads to his hatred. This can be explored in various ways, such as through flashbacks or interactions with other characters who have different views of Dumbledore.
One common theme is his discovery of self. In many fanfictions, young Albus is on a journey to figure out who he is, his place in the wizarding world, and his values. Another theme is friendship. Writers often explore the friends he made during his youth and how those relationships shaped him.
The theme of forbidden love is quite prevalent. Their relationship was not straightforward in the original story, and in fanfiction, it's often explored as something that is not easily accepted by the wizarding society. Also, the theme of sacrifice. They might have to sacrifice their love for the safety of others or for a greater cause. In some fanfictions, their love is also about self - discovery. As they get closer, they learn more about themselves and their own values.
One common theme is his so - called 'manipulation' of Harry. Some fanfics focus on how Dumbledore used Harry for the greater good without really considering Harry's personal feelings. Another theme is his secrecy. Writers in these fanfictions often explore how his secrets had negative consequences for the characters around him.
It could be about a character named Issei facing a situation where he is overpowered or defeated in some way. Maybe in a battle or a competition within the fictional world of the fanfiction.
Fred and George Weasley are very likely candidates. They are known for their love of pranks and their mischievous nature. They might see pranking Dumbledore as the ultimate challenge.
One possibility is that Dumbledore gets caught spying on a group of Death Eaters. This would put him in a very dangerous situation as the Death Eaters are extremely cruel and loyal to Voldemort. He might be tortured for information about the Order of the Phoenix. However, Dumbledore is very resourceful and would probably be able to hold his own against them for a while, giving his allies time to figure out a rescue plan.
The fanfiction could focus on Dumbledore's backstory. Fans might write about his early years at Hogwarts as a student, his friendships, and how he developed into the great wizard he became. It could also include his interactions with other magical creatures in more depth than the original series, such as having secret meetings with centaurs or merpeople to gain wisdom.