The main characters are Pluto and the king, of course.
Obviously, Pluto and the king are the main characters. Pluto might be some sort of subject or entity in relation to the king who has power over him. We don't know much more without further details of the story, but these two are central to it.
Since it's about Pluto, Pluto is likely to be the main character. There may also be other characters like Santa Claus if the story involves the typical Christmas elements. Or it could have other animals or people in Pluto's world who interact with him during the Christmas story.
One could be a scientist who is obsessed with Pluto's mysteries and the other could be a being from Pluto itself. For example, a shape - shifting entity that the scientist discovers during his research.
The main character is Patrick 'Kitten' Braden.
Since I don't know the exact 'Pluto Series Novel', I can't tell you the main characters. But usually, in a novel series, there are protagonists who drive the story forward. They could be ordinary people caught up in extraordinary situations related to the Pluto concept in the story.
Sebastian would be a great character to pair with Pluto. Their master - servant relationship has a lot of potential for exploration. There's the power dynamic, with Sebastian being in control but Pluto having his own strength. It could lead to some interesting power struggles and character development.
There are different characters in 'For the King'. You can have a warrior - type character who is strong in combat. There is also often a mage - like character who can use magic to fight enemies or solve puzzles.
Well, of course, Percy Jackson himself. He is the central figure. Then there would be other demigods like Annabeth Chase. She could play a crucial role in helping Percy understand his new connection to Pluto. There are also likely to be characters related to Pluto, such as Nico di Angelo. He might be a mentor or a fellow adventurer in the fanfiction.
Since I don't know the exact'south king south king story', I can't say for sure who the main characters are. But as the name suggests, South King might be a main character.
If it's about a competition, all the birds are sort of main characters. But if it's about a specific 'king' bird like an eagle, then the eagle is the main one. There might also be other animals or birds that interact with the 'king' in the story.
The main character is obviously the selfish king. There may also be his subjects, like the peasants, knights, or advisors who interact with him and are affected by his selfishness.