There could be a regular customer. This person might be a key character as they could have a special connection with Petebella. Maybe they always request Petebella for lap dances and over time, a unique bond forms between them, which could be a major plot point in the fanfic.
One possible main character could be the club owner. He might play an important role in Petebella's story, like setting the rules and regulations that Petebella has to follow, or perhaps having a father - figure - like relationship with him.
Perhaps the story focuses on Petebella's personal growth. Working at a club and doing lap dances might be a stepping - stone for him. He could start off shy or uncertain, but as the story progresses in the fanfic, he gains more confidence and learns valuable life lessons from his job.
Maybe it's an established Pokemon coordinator who has come to the Nimbasa City night club to get inspiration for new performance routines. They meet all sorts of interesting characters at the club, from other coordinators to DJs who use Pokemon - inspired music. Along with their trusty Pokemon partner, they navigate the exciting and sometimes cut - throat world of the night club dance scene.
I don't know for sure as it depends on the specific fanfic. There could be a boss - like character who oversees Harry's work in the unit.
It's also possible that some of Salem's minions play important roles. They could be constantly testing Naruto's loyalty to Salem. Characters like the Grimm could also be prominent, and Naruto might have to find ways to deal with them while working for Salem.
Sasuke could be one of the main characters. He might be initially skeptical or even hostile towards Naruto's mermaid side, but as the story unfolds, he could come to understand and support Naruto. Another character could be Sakura. She could use her medical ninjutsu skills to help Naruto if he gets injured during his underwater adventures.
Another character could be a fellow inmate who has been in jail for a long time. He befriends Harry and teaches him the ropes of surviving in jail.
Well, there could be a character who is Shikaino's partner in a joint venture. They have different working styles but they need to find a way to work together to make the business successful. Also, there could be a journalist character who is interested in covering Shikaino's rise in the business world and may either help or hinder her depending on the situation.
Azmuth, the creator of the Omnitrix, could be a main character. He might be interested in Eon's manipulation of time and the Omnitrix - related powers. His advanced technology and intelligence could add a new dimension to the fanfic. Also, characters from different timelines that Eon has affected could make appearances, like alternate versions of Ben or his friends.
Anakin's mother, Shmi, would likely be a very important character. Since Anakin is not being trained as a Jedi, he would be more focused on his family. Shmi's influence on Anakin would be even greater, and she could play a role in guiding his actions and decisions, especially in relation to the local community on Tatooine.
A lawyer could be an important character. This lawyer takes on Alexis's case, believing in their innocence. The lawyer has to battle a corrupt legal system or powerful opponents who want to see Alexis locked up for good. The fanfic could show the lawyer's strategies and how they build a case in Alexis's favor.