Well, the girl herself is surely one of the main characters. But without reading the novel, it's hard to say exactly who else. There might be someone she is running from, like a villainous figure.
Perhaps there is a friend or a mentor figure in the novel. If the girl is on a journey of self - discovery, there could be someone who helps her along the way, guiding her and giving her advice. This person could be an important main character as well.
It could be that the main character is an older girl or a woman who is coming back to running after a long break. She might have faced some setbacks in her life, and running becomes a way for her to regain her strength and independence. Her family members and friends, who either support or oppose her decision to run, could also be important characters in the story.
Since I haven't read it, I can't say for sure. But it could be a young man and a young woman who are the main characters, as is often the case in love - themed novels.
It's possible that the main characters are outsiders in a society. They might be running because they are different and not accepted. Through their running, they could find others like them and form a new community. Or perhaps they are rebels fighting against an unjust system and their running is part of their resistance strategy.
There's Caballo Blanco. He is a key figure in the running community depicted in the novel. He has a certain charisma and knowledge about running that attracts others.
There's no way to determine the main characters without more information about the 'cut and run novel'. However, in a general sense for this type of story, it might be a character who is fearless and quick - witted. This person could be leading others in the 'cut and run' scenario. Or perhaps it's a young protagonist who is forced to grow up fast due to the need to cut and run. There could also be an antagonist who is chasing the characters who are trying to escape.
Logan is one of the main characters in Logan's Run novel. He is a Sandman, a kind of enforcer in the society. Jessica is another important character. She becomes involved with Logan and challenges his views and the system they live in.
Haiji Kiyose is also important. He is the one who brings the team together and has great leadership in the running group.
Kakeru Kurahara is one of the main characters. He has a troubled past but finds new meaning and purpose in running. Another important character is Haiji Kiyose. He is the one who brings the team together and has great leadership skills in the running group.
There could also be a detective - like character who is running for his life while trying to solve a mystery. He might be getting too close to the truth in a case involving powerful and dangerous people, and now he has to use his wits not only to solve the mystery but also to stay alive while being chased by the bad guys.
I'm not sure without reading the story specifically, but it could be someone escaping from danger, like a fugitive or a refugee.