Most likely Harry Potter himself would be one of the main characters. After all, it's in the title related to the Harry Potter world. And of course, the ogre would be a main character too as it's a key part of the fanfiction.
There might also be Hermione and Ron. They are Harry's best friends in the original series. In this fanfiction, they could be involved in the story with the ogre. For example, they might help Harry figure out what to do with the ogre, or they could be in some sort of conflict with the ogre at first and then become friends.
The physical presence of ogres is also a unique aspect. Ogres are big and strong, so they can add a different dynamic to action scenes. In fanfictions, they might be involved in battles or challenges where their brute strength becomes a crucial factor. Also, their appearance can be quite intimidating compared to the more 'human - like' wizards and witches.
In 'the king and the ogre story', the two main characters are the king and the ogre. The king is in charge of his kingdom and has to make decisions for the safety and well - being of his people. The ogre, on the other hand, is a creature that causes trouble for the king. There could be other characters like the peasants in the king's kingdom who are affected by the ogre's actions, but the focus is mainly on the interactions between the king and the ogre.
In most 'ogre girl novel', the ogre girl herself is a main character. For example, in 'Goblin Girl's Quest', the ogre girl named Grala is the central figure. She is brave and determined. Another character could be the wizard who often helps or hinders the ogre girl's journey, like in 'The Ogre Maiden's Tale' where the wizard Zarek plays an important role in her story.
There could be a young girl or boy as the main character. They might be an outcast in their community but turn out to be the key to dealing with the ogre. There could also be an old wise man or woman who guides the main character with their knowledge about the ogre.
There could be the ogre as the central character. If it's a love story, there must be someone the ogre loves. It could be a kind-hearted witch who sees the good in the ogre. Or it could be a brave knight who, instead of fighting the ogre, falls in love with it. There might also be a sidekick character for the ogre, like a little goblin friend who helps the ogre in its quest for love.
Perhaps a plotline where the ogre has some sort of special power that the wizards in Harry Potter are interested in. This could lead to a whole series of events where they try to either control or cooperate with the ogre.
Well, clearly Vionery is one of the main characters. Depending on the story, Harry Potter himself might also be a central figure, as he often is in most Hogwarts - related fanfictions. Hermione Granger could also be involved, using her intelligence to assist Vionery in her adventures or studies at Hogwarts.
In harry potter the marauders fanfiction, the main characters are the Marauders themselves. James Potter, the confident and sometimes arrogant Gryffindor. Sirius Black, the black sheep of his pure - blood family. Remus Lupin, the kind - hearted werewolf. And Peter Pettigrew, who was initially part of their tight - knit group. Their interactions, friendships, and later the events that lead to their fates are central to these fanfictions. They are often depicted in their Hogwarts days, full of youth, adventure, and magic.
Harry Potter is the mainstay, as the story is based in the Harry Potter universe. Kurama is the new element that makes it a crossover. In addition, characters like Snape could play significant roles. Snape's complex nature might lead to interesting interactions with Kurama. He could be initially hostile but then come to realize Kurama's value in the fight against the dark side. And of course, Hagrid, with his love for magical creatures, might befriend Kurama and help him adjust to the wizarding world.
Hermione Granger might also be a main character. She is an important part of the original series and her intelligence and knowledge would be useful in uncovering any truths in this fanfiction. Also, Ron Weasley could be there as Harry's loyal friend, and together they could face the challenges related to the 'truth' in the story.