Harry is a must - be main character here. His mate, of course. But also, there could be entirely new characters created specifically for this fanfiction. For example, some wise old elves who have knowledge about the history of the king mate concept. Or perhaps some young, brave wizards and witches who are inspired by Harry and his mate and join their cause. All these characters would interact and shape the story in 'harry is a king mate fanfiction'.
Obviously, Harry Potter and Viktor Krum are the main characters. Harry is from Hogwarts, known for his adventures against Voldemort. Krum is the famous Quidditch player from Durmstrang. Their different backgrounds make for an interesting dynamic in the fanfiction.
Obviously, Harry and Zeus are the main characters. Harry, who might be from the Harry Potter universe, would bring his own set of skills and personality traits. Zeus, as the king of the Greek gods, would have his power and authority. There could also be other characters from either the wizarding world or the Greek mythology that play supporting roles, like Hermione from Harry's world who could try to understand what's going on, or Athena from Greek mythology who might have an opinion on Zeus's new relationship with Harry.
The main characters are Harry and Jareth. Harry is from the world of wizards, known for his courage and magical abilities. Jareth, on the other hand, is often depicted as a powerful and somewhat mysterious figure from his own magical realm. In the context of this fanfiction, their relationship as'mates' is central to the story.
Obviously, the Twilight King is one of the main characters. He is likely to be a powerful and mysterious figure with his own set of powers and a kingdom to rule. His mate is another main character, though we don't know much about this character yet. There might also be some side characters like advisors to the king, or perhaps other magical beings in the kingdom who play important roles in the story.
Hermione could be a main supporting character. She might be very suspicious of Lucius and try to warn Harry about the potential dangers of this relationship. Dumbledore could also be a supporting character. He could offer his wisdom and guidance to Harry, especially when it comes to dealing with Lucius. Ron might be another one, constantly expressing his doubts and concerns about Harry's new 'mate' situation.
Obviously, Harry and Moony (Remus Lupin) are the main characters. Harry is the central figure in the Harry Potter series, and here he has a special relationship with Moony.
The main characters are Harry and Percy. Harry, with his Gryffindor courage and magical skills, and Percy, perhaps with his own distinct powers and personality. In this fanfiction, their relationship as mates is the core element, and other characters may be introduced to either help or hinder their bond - forming process.
Since I haven't read it, it's hard to say exactly. But based on the title, Harry Potter and his'mate' who is a god - like figure are likely to be main characters.
Obviously, Harry and Gabriel are the main characters since Harry is said to be Gabriel's mate.
The main characters are clearly Harry and Jasper. Harry is likely to be a character with his own set of traits, perhaps brave and curious. Jasper, on the other hand, may have characteristics that complement Harry's. They are the central focus as they are the ones in the mate relationship.