Obviously, X and Y are the main characters. X might be a brave and curious individual, always ready to take on new challenges. Y could be more of a cautious yet intelligent character, providing a balance to X's impulsiveness.
X and Y are the central figures. X could be known for his special powers or abilities that set him apart. Y, on the other hand, might have a great deal of knowledge about the world they inhabit, which helps them in their various escapades. They are the ones around whom the story of the fanfiction revolves.
One popular theme could be their adventures together. Maybe they go on a quest to a mysterious land filled with strange creatures. Another theme might be their friendship development, like how they overcome misunderstandings to become closer pals.
I think Professor Sycamore would be an interesting character to pair with Calem in fanfiction. Calem could be his assistant for a special research project on Mega Evolution. This would give Calem a chance to learn more about the secrets of Pokemon from the professor. Also, Tierno could be paired with Calem. They could have a dance - off with their Pokemon, which would be a really fun and unique scenario in the fanfiction.
One potential antagonist could be an ancient magical entity that has been awakened by the experiments of the Unspeakables. It sees Harry and the Unspeakables as a threat to its existence and tries to destroy them. Additionally, there could be a group of anti - Ministry wizards who believe that the Unspeakables are dabbling in dangerous magic and they target Harry as a symbol of the Unspeakables' activities.
In addition to the ones mentioned, Diantha, the Kalos Champion, is a great character to include. Her elegance and strength in battles can be a focal point. Also, Shauna, Tierno, and Trevor, the friends of Calem or Serena, can bring a lot of fun and friendship dynamics to the story. They can have their own mini - adventures within the larger fanfiction, like exploring a new part of the Kalos region together or trying to catch a rare Pokemon.
Pikachu is definitely a common character. It's Ash's most loyal partner and is always by his side during his adventures. Serena is also often present. She has her own dreams and goals related to Pokemon and often travels with Ash, providing support and sometimes even competing with him.
Obviously, Yn and Doctor Blueberry are the main characters. Yn is likely the protagonist who is new to the Underswap world, and Doctor Blueberry is an important figure in that world.
Well, clearly Vegeta and Bulma are the main characters. Vegeta, the proud Saiyan warrior, and Bulma, the brilliant scientist.
Naruto, the orange - jumpsuit - wearing ninja with his signature rasengan. He's got that indomitable spirit. And Ryuuzetsu, who might be a new character to some. She could be a powerful ninja in her own right, maybe with some special water - based jutsu or some other unique ability. Together, they are the focus of the fanfic, and their interactions drive the story forward.
Since the title is so unclear, it's impossible to say who the main characters are. It could be that the 'last man' is the main character, but without more context, we can't be certain.
The main characters would likely be the hybrid from BTS and the 'y n hurt human'. The BTS hybrid is an important part as they bring in the element related to the group BTS, and the hurt human is the focus of the 'hurt' aspect which drives the story.