The main characters are Striker and Moxxie. Striker might be seen as the more dominant and aggressive one. He has his own goals and ways of doing things in Hell. Moxxie, who is associated with I.M.P., has his own set of friends and a life that gets intertwined with Striker's in the fanfic, creating a lot of interesting interactions and storylines.
You can start by looking on popular fanfic websites like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, and you're likely to find quite a few 'Moxxie x Striker' ones there.
One popular 'Moxxie x Striker' fanfic is 'The Unlikely Bond'. It delves into a scenario where they are forced to work together on a mission and gradually develop an understanding of each other.
One possible interesting plot could be Striker and Moxxie being forced to work together on a dangerous mission. They start off hating each other but gradually come to respect one another's skills as they face various challenges.
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.
In a fanfic, Moxxie's accent could be a central part of a romantic storyline. Suppose there's a character who is initially put off by her accent but then gradually falls in love with her as they get to know her better. Her accent becomes something endearing and special, and they have cute exchanges where he tries to imitate her accent playfully.
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.
Well, as the title 'ryan x tina fanfic' implies, Ryan and Tina are the main characters. Ryan might be a young man who has his own dreams and goals. He could be into sports or academics or something else entirely. Tina, on the other hand, is another important figure. She could be a girl who is passionate about art or helping others. Their personalities will be explored in the fanfic, and how they interact with each other is what will drive the story forward.
The main characters are Kururu and Mois, of course. Kururu might be depicted as a clever and resourceful character, perhaps with some hidden powers or talents.
Well, obviously the main characters are Kaa and Mowgli. Kaa is the sly and intelligent snake, known for his hypnotic powers. Mowgli is the man - cub, who is trying to find his place in the jungle. Their interactions form the core of the fanfic.