Maybe Dumbledore, if he were still alive in the fanfiction. Dumbledore was highly respected and had a great influence. Knighting Harry would be a way for him to publicly recognize Harry's achievements and heroism on a grand scale.
In the 'Harry Potter gets knighted' fanfiction, perhaps Harry is honored for his heroic deeds against Voldemort. He might be knighted in a grand ceremony at Hogwarts, with all his friends and professors present. The Ministry of Magic could finally recognize his great contributions to the wizarding world.
Well, it could be that the Queen has a special connection to the wizarding world in this fanfiction. Perhaps she has been secretly informed of Harry's bravery and selflessness all along. And as a symbol of the British monarchy, she knights him to show that the Muggle and wizarding worlds can have a positive relationship. So, she bestows this honor on Harry.
You can try fanfiction websites such as Archive of Our Own (AO3). It has a vast collection of 'Harry Potter' fanfics, and there's a good chance you'll find some related to Harry being knighted there. Just use the search function and type in relevant keywords like 'Harry Potter' and 'knighted'.
There might be a 'Harry Potter knighted fanfic' where Harry is knighted by the Ministry of Magic in a special ceremony. In this story, the author could explore how his friends react to his new honor. Hermione might be proud yet also worried about how this new status could change Harry. Ron, on the other hand, would probably be in awe and full of jokes about his 'knighted mate'.
Well, Harry could marry one of the veelas. Given their beauty and allure, it would add an interesting dynamic to the story. Their relationship could involve Harry having to deal with the jealousy of other wizards and also the cultural differences of the veelas. Or he could marry a descendant of one of the founders of Hogwarts. This would tie in a lot of Hogwarts history into their relationship, and their wedding could be a grand event that unites different factions within the wizarding community who have ties to the founders.
I'm not entirely sure specifically as 'gets knotted' isn't a common Harry Potter term in the official works. It could potentially be a very unique and perhaps strange fanfiction where some new or alternative situation is created for Harry Potter. It might involve some complex plot twists or new relationships that are not part of the original story.
Yes, there might be such fanfiction out there in the vast world of fan - created works. However, this kind of story often takes a rather unorthodox and perhaps controversial approach to the characters. Fanfiction can cover a wide range of themes and interpretations, but this one is likely to be quite different from the typical Harry Potter stories we know.
I'm not sure specifically as there could be many different interpretations in fanfiction. It might be about Harry Potter getting revenge or evening the score in some way that wasn't shown in the original books. Maybe he's dealing with his enemies in a new and unexpected manner.