It could be Hermione. In some alternate interpretations, there could be a situation where Hermione, while trying out a new and powerful magic, accidentally hurts Harry. Their friendship is put to the test as Harry has to deal with the pain and Hermione has to come to terms with what she's done.
The 'Twilight' series could also be considered similar. It has a romantic relationship between different beings, much like what might be in 'his sweet little mate novel'. The story of Bella and Edward is well - known for its unique take on love and relationships.
Maybe it's Ron. Suppose Ron gets jealous of Harry's fame and power and, in a moment of weakness and envy, decides to abandon Harry to die. This would create a lot of drama as Ron and Harry have been friends for a long time, and such a betrayal would be a huge shock to the story's readers.
Since I haven't read this novel, it's hard to say for sure. However, from the title, it seems that the main focus is on the relationship between a king and someone referred to as his 'little mate'. It could be a story full of courtly love, where the 'little mate' might be a commoner or a person from a different social class. The story may then revolve around how they overcome the barriers of class and status, and how their relationship affects the kingdom as a whole, whether it brings about positive changes or causes unrest among the nobility.
It could be the Death Eaters. Even if they are on the 'bad side', they might see an opportunity to disrupt Harry's life and weaken him. By forcing him to reject his mate, they can create emotional turmoil for Harry, which would make him less focused on fighting against them.
This type of fanfiction often dives into the psychological aspects of the characters. The kidnapped mate may experience a range of emotions such as fear, anger, and confusion at first. As the story progresses, they might start to see Klaus in a different light. The writer could also introduce other characters who react to this situation, either trying to rescue the mate or siding with Klaus, which adds more layers to the story.
One possible reason could be some sort of external threat. Maybe there's a dark force that wants to use his mate against him, so to protect her, he's forced to reject her. For example, if there are dark wizards who plan to capture his mate and use her as a bait to get to Harry, he might think rejecting her would keep her out of danger.
Since I'm not familiar with the 'the kings little mate novel', the most obvious main characters would be the king and his so - called 'little mate'. But there could be other important characters too. For example, if the story is set in a complex political environment, there might be rival nobles who oppose the king's relationship with his 'little mate'. Or perhaps there are servants or friends of the 'little mate' who help them navigate the difficult world of the royal court. Without reading the book, it's all speculation, but these are the types of characters that could be central to the story.
Yes, there are quite a few. You can start by looking on fanfiction platforms like Archive of Our Own. Some stories might explore an alternate universe where Harry and Lucius have an unexpected bond, perhaps in a world where the lines between good and evil are more blurred. It often involves complex character development and unique plot twists.