In some cases, they could be the author's interpretation of two archetypes. Kairack as the hero figure, always ready to face challenges, and Reana as the damsel in distress who turns out to be much stronger and more resourceful than she seems at first.
They could be two original characters created specifically for the fanfic. Kairack might be a strong and brooding character, while Reana could be a kind - hearted and intelligent one.
Perhaps Kairack and Reana are in a school setting. Kairack is the popular athlete and Reana is the shy, studious girl. They are paired for a project and at first, they clash because of their different personalities. But as they work together, they discover they have a lot in common and start to develop feelings for each other.
A 'karack x reana fanfic' could cover a wide range of themes. It might be a fantasy - themed story where Karack and Reana have special powers and they use those powers to fight against an evil force. Or it could be a slice - of - life story, showing their daily lives, their friendships, and how they interact with the other characters in the fan - created universe.
You could try looking on fanfic websites like Archive of Our Own or Fanfiction.net. They have a large collection of fanfics from various fandoms, so there's a chance you might find the 'karack x reana fanfic' there.
Obviously, Pwrcy and Apollo are the main characters. Pwrcy might be a character with unique powers or abilities, while Apollo could be someone with great wisdom or strength.
I'm not sure specifically as I haven't read it in detail. But often in fanfics, there are characters from the original source that the fanfic is based on. So it could be the main characters from the 'x' that it's related to.
Obviously, Goku and 17 are the main characters. Goku, the Saiyan hero with his incredible power and love for fighting. 17, the powerful android with his own set of skills and a somewhat mysterious past.
The main characters are clearly Reid, JJ, and Emily. Reid, with his eidetic memory and love for knowledge, JJ, the compassionate and family - oriented one, and Emily, the experienced and often enigmatic one. Their interactions, whether it's during a case, at the office, or in their personal lives, form the core of the fanfic. For example, Reid might share some obscure fact, JJ would respond with her practical take, and Emily would add her own cynical or worldly - wise comment.
The Prowler is a really underrated character. He has a cool look and an interesting backstory. In a fanfic, he could be a sort of anti - hero, someone who has his own code but doesn't always see eye - to - eye with Spiderman. Maybe he starts out as a foe but then they have to work together against a bigger bad.
He might be an old friend of Harry's parents who was thought to be dead. But he resurfaces and has a lot of knowledge about James and Lily Potter that he shares with Harry. This knowledge could help Harry in his fight against the remaining dark forces in the wizarding world.
A powerful demon from another dimension could be the main villain. This demon could be seeking to destroy all Saiyans and starts targeting Goku, Caulifla, and Kale. He has unique powers that they have never faced before, like the ability to nullify their energy attacks.