Naruto and Sasuke are likely to still be main characters. They are central to the Naruto story, and in a fanfiction like 'breaking point', they would probably play important roles in the new plot. Naruto with his never - give - up attitude and Sasuke with his complex motives.
Since it's a fanfiction, the main characters could vary widely. It could be about Neville Longbottom reaching his breaking point, finally stepping up as a powerful wizard. Or it could center on Luna Lovegood, exploring her journey when she reaches a point where she has to be more assertive or face a difficult situation in the wizarding world. So, without reading the specific 'breaking point' fanfiction, it's hard to say exactly who the main characters are.
There could be new characters created specifically for this fanfiction. Maybe there's a character who is influencing Naruto to break ties, or a character who is affected by Naruto's decision to break ties. It's also possible that some of the antagonists from the original Naruto series play a major role in this fanfiction, if their actions lead Naruto to make the decision of breaking ties.
Sasuke could also be a main character. In the Naruto universe, Sasuke has a complex relationship with Naruto, and in this fanfiction, he might play a role in Naruto's decision to break ties, either as an instigator or someone who is also affected by Naruto's actions.
The main character is Naruto without a doubt. But in 'breaking limits naruto fanfiction', antagonists can also be important characters. For example, Orochimaru might be a character who, through his devious schemes, forces Naruto to break his limits in order to survive or protect others. Also, Hinata could be a significant character. Her love and belief in Naruto might give him the emotional strength to break through his mental and physical limits, making her an important part of the story.
One interesting plot point could be new and unique jutsu that the characters develop. For example, Naruto might discover a jutsu that combines his Rasengan with a new element. Another could be different relationships between characters. Maybe Sasuke and Naruto have an even more complex friendship in this fanfiction, with new challenges that test their bond.
I'm not sure specifically as there could be many different 'Breaking Point' Harry Potter fanfictions. It might be about a moment where a character reaches their breaking point, perhaps Harry dealing with the stress of fighting Voldemort, or Hermione struggling with the pressure of schoolwork and the wizarding world's problems.
I'm not sure who the author of this specific 'breaking point a joe pickett novel' is without looking it up. But many Joe Pickett novels are written by C.J. Box.
It's likely that Harry, Hermione, and Ron would still be main characters, but perhaps they interact with new characters who are experts in zero - point energy.
Since I don't know the specific 'breaking the girls story', I can't say for sure who the main characters are. It could be two girls named, say, Alice and Beth if it's a simple story about friendship between two young women.
As I have no information about the 'breaking the girl novel' itself, it's impossible to name the main characters accurately. However, in most novels with such a title, the girl is surely one of the main characters. There could be another character who is in some sort of conflict or relationship with her. For example, if it's a romantic story, a male lead could be another main character. Or if it's about family dynamics, a parent or a sibling could be important characters.