No. In the traditional 'Harry Potter' series, Harry and Voldemort are enemies. This idea of Harry being Voldemort's consort goes against the main plot and the moral framework of the original story. So it's not a common theme in regular fanfiction.
Well, in this kind of fanfiction, there might be an exploration of a different side of Voldemort's character. Maybe he shows a softer or more complex side when in a relationship with Harry. And for Harry, it could be about him trying to use his new position to bring about change in the dark wizard's ways. It could also delve into the magic that might be unique to their union, like new spells or powers that emerge from their combined forces.
Obviously, Harry Potter and Voldemort are the main characters. But there could also be other important characters like Hermione and Ron. Hermione might be trying to understand Harry's decision and Ron could be in shock or even feel betrayed at first. Dumbledore, even in spirit form perhaps, could also play a role as he was always a guiding figure for Harry and his presence could still influence Harry's actions in this strange new situation.
Some people might create such fanfiction for the shock value. It's a very different and unexpected take on the characters. They want to see how they can twist the traditional story.
One common theme is the power struggle. Since both Harry and Voldemort are powerful in their own ways, fanfics often explore how their relationship affects the balance of power in the wizarding world.
There are a few. They usually play with the idea of an alternate universe where Harry and Voldemort have a different kind of bond. Some are quite creative, like they might have Harry using his unique connection to Voldemort to bring about peace in the wizarding world in a very unorthodox way. But of course, these are all very different from the original story's premise.
I'm not sure about the exact name, but there are some fanfics where Harry and Voldemort are magically bound together in some way. These often involve a lot of plot twists as Harry tries to navigate this new situation while still dealing with his friends and the fight against the dark forces. They usually play with the idea of redemption and the power of love in a very different context compared to the original books.
It would be a very strange and dark fanfic. Harry is the hero who is supposed to defeat Voldemort, so making him Voldemort's consort completely flips the original story's dynamic.
It's possible. In the realm of fanfiction, the imagination knows no bounds. Writers might come up with such a scenario for various reasons, perhaps to explore a different side of the characters' relationships. But it's not a common or mainstream concept within the Harry Potter fanfiction community, as it goes against the typical character dynamics we expect from the series.
In many fanfictions, Harry Potter squinting at Voldemort could be a sign of intense focus. It might be that Harry is trying to read Voldemort's next move, or perhaps he's looking for some sign of weakness. For example, in some stories, Harry's squinting could be related to his newfound magical abilities that he's using to analyze Voldemort's magic signature.