Well, in certain fanfictions, the Dementor's Kiss is often explored in relation to a character's hidden past or secrets. Maybe a character who was supposed to receive the Kiss actually has a dark past that the Dementors are drawn to, but this also gives them a strange power to resist it. It can also be used as a way to explore the nature of the soul in the Harry Potter universe more deeply.
It's not a very common or popular concept. Harry Potter is typically seen as a hero opposed to Dementors, which are dark and terrifying creatures. Fanfiction usually focuses on more positive or heroic aspects of Harry's character rather than making him a fan of Dementors.
In the books, the Dementor's Kiss is mostly shown as a final, soul - sucking end. But in fanfiction, characters might survive it with some strange changes. For example, they could become more withdrawn or have a new ability to sense Dementors.
If Harry gets the Dementor's kiss in fanfiction, it would likely be a very dark turn of events. His soul would be sucked out, leaving his body an empty shell. This could have a huge impact on the wizarding world. His friends, like Ron and Hermione, would be devastated. They would probably be on a mission to find a way to reverse it, if possible. It could also lead to chaos as Voldemort might take advantage of Harry's absence to gain more power.
It would be really dark and mysterious. Harry as a Dementor Animagus would have some very different powers and abilities. He might be able to control the Dementors in a way, or use their fear - inducing abilities for his own purposes, perhaps in the fight against Voldemort. But it would also be a struggle for him to control his Dementor side, as Dementors are associated with negative emotions.
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.
Another theme is the nature of darkness. Since Dementors are associated with darkness, fanfics often explore how the Dementor King embodies this darkness and how it affects the characters around him. They might look at how the characters struggle against this all - consuming darkness. For example, a character might have to find their inner light to resist the Dementor King's influence. It can also involve themes of redemption, as some stories may have the Dementor King or those influenced by him seeking redemption from their dark deeds. This adds a layer of complexity to the characters and the overall story.
The plot would change drastically. Without Harry, the hero, the fight against the dark forces would lack its central figure. The Order of the Phoenix might fall into disarray. Hermione and Ron would likely be the ones to try and fill the void, but it wouldn't be easy. There could be a search for a way to bring Harry back, which could involve dangerous and unknown magic.
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.
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.