* Kayla "Kay" McMillan: A 16-year-old girl who works as a janitor at a private school, struggling to make ends meet and deal with her troubled home life.
* Jared "J.D." Campbell: A popular and wealthy student at the school, who develops a unique bond with Kay despite their vastly different backgrounds.
* Millie: A kind and supportive fellow janitor, who becomes a mentor to Kay and helps her navigate the challenges of her job.
* Mrs. O'Brien: The headmistress of the school, who is initially skeptical of Kay but eventually sees her strength and potential.
While these are the central characters, there are many other supporting characters who play significant roles in the story.