Well, it could start with Harry being in a situation where he has no other choice but to absorb the dementor. After that, he might struggle with the dark energy he has taken in. However, he could also learn how to control it. This new power could give him an edge in the fight against evil. He might be able to sense the presence of other dark creatures more easily and be better prepared to face them. And it could also lead to a new understanding between him and the Ministry of Magic, as they see him as a more powerful asset in the fight against the dark arts.
One possible plot is that Harry absorbs the dementor in a moment of extreme danger. This changes him in some ways. His Patronus might become more powerful as a result. He may also start to understand the dementors' origin and find a way to stop their creation. He could then share this knowledge with the wizarding world.
Well, it could be about a Harry Potter who has some special power over Dementors. Maybe he can control them instead of just fending them off with a Patronus. He could use this new - found power to his advantage in the wizarding world, like using Dementors to guard against dark wizards.
One possible plot could be that Harry's mother was secretly researching dementors for some noble reason, like finding a way to cure their 'evil' nature. She might be collecting information about them, which could put her in danger as dementors are not to be trifled with. This could then lead to a series of events where her knowledge is passed on to Harry in some way, and he has to continue her work.
His character might become more complex. He could have a darker side that he has to struggle with. For example, he may be more withdrawn at times due to the dementor's influence.
The story could start with Harry having a near - death experience where a Dementor's kiss was almost upon him. Instead of being terrified, he becomes oddly fascinated. He begins to research their origin, their connection to Azkaban, and their role in the wizarding world. As he does this, he discovers some ancient magic related to Dementors that no one else knew. This knowledge could either lead him down a dark path or help him to change the way Dementors are perceived in the wizarding community.
In a fanfiction where Harry Potter kills a dementor, it could lead to many consequences. First, the wizarding world might react with shock as dementors are usually just sent back to Azkaban. It could also change Harry's perception of himself as a wizard, as taking a life is a huge deal. Maybe he would face some sort of backlash from the Ministry of Magic for acting outside the normal procedures of dealing with dementors.
Yes, it's possible in fanfiction. It could be justified as self - defense. If a dementor was about to attack an innocent, especially someone Harry cared about, he might be pushed to use a powerful spell to kill it rather than just the Patronus charm which usually just drives them away.
Maybe it's a rogue group of wizards who fear Harry's power over Dementors. They might think that Harry is going to use the Dementors to take over the wizarding world in an unjust way. So they band together to try and stop Harry before he can fully embrace his role as the King of Dementors.
I'm not sure if there's a particular well - known fanfiction with exactly this plot. There are so many fanfictions out there that it's hard to keep track. You might have to do some in - depth searching on fanfiction websites.
It could lead to major power boosts for Harry and change the course of the story significantly.
Dumbledore could be his mentor. Even in death, his portrait or some magical remnant of him could guide Harry. Dumbledore was always knowledgeable about magic, and he could have left behind some secret teachings about mana absorption for Harry to discover.