It's also possible that the fanfiction introduces new original characters. These could be characters created specifically for this fanfiction, like a new apprentice for the Supreme Kai of Time or a mysterious being from another dimension that she has to deal with.
There might be other characters from the original series that interact with her. For example, other Kais or powerful warriors who get involved in her adventures, either as allies or antagonists depending on the story.
Obviously, the Supreme Kai of Time is a main character. She is central to the fanfiction as she has unique powers related to time.
Trunks could be another character. Given his experience with time - travel in the original story, he would have a natural connection with the Supreme Kai of Time. He could be involved in helping her to fix any disruptions in the timeline that he may have knowledge about or be a part of. His future - savvy perspective could be valuable in the fanfiction's plot, especially when dealing with potential threats to the future that are related to the time - space continuum.
Well, given the name, the Supreme Kai of Time is surely one of the main characters. There might also be other characters related to the concept of time in Dragon Ball, like Chronoa, who could potentially be involved. And perhaps some of the more common Dragon Ball characters like Goku or Beerus might make an appearance if the story is set within the main Dragon Ball universe and the events of the 'cannon' somehow impact the broader world of Dragon Ball.
One interesting concept could be the unique interpretations of the Supreme Kai of Time's character. Maybe the fanfiction explores her relationships in ways not shown in the original source, like her interactions with other deities or mortals in a more personal level.
A power - hungry warlord from another dimension could be the main antagonist. He notices the unique connection between Naruto and the Supreme Kai of Time and sees it as a threat to his plans of universal domination. He uses his advanced technology and some stolen time - based magic to try and disrupt their bond and conquer both their worlds. He has an army of powerful minions and is constantly devising new strategies to outwit Naruto and the Supreme Kai of Time.
One potential character could be a new time - traveling warrior from a different dimension. This character could bring in unique fighting styles and powers that the Dragon Ball characters have never seen before.
In a Supreme Kai of Time love fanfiction, the story could involve time - traveling adventures. For example, she could meet someone in a different era and they develop a romantic connection. The power dynamics between them, with her being a powerful Supreme Kai and the other character having their own strengths, would make for an engaging plot.
Another common theme is her relationship with other characters in the Dragon Ball universe. In some fanfictions, she has to team up with Goku or Vegeta to save the world or the entire universe. There are also fanfictions that focus on her role as a protector of the timelines and how she has to make tough decisions to maintain the balance of time. For example, she might have to sacrifice one timeline to save another. It really shows the weight of her responsibilities.
Well, obviously the Supreme Kai would be one of the main characters. They are central to the fanfic's premise.
Vegeta could also work well. Vegeta's pride and determination, along with his powerful fighting skills, would contrast nicely with the Supreme Kai's more reserved and wise nature. They could learn from each other and have some intense rivalries within the story.