Protagonist. A dentist who dies and goes to Limbo, where she signs a contract to become the Tooth Fairy. She trains under Raul, helps lonely boy Bobby Jameson and his friends, and temporarily becomes visible to adults despite breaking Limbo rules. After being sentenced to Hell, she awakens alive on Earth with a second chance, returns to dentistry, and begins a romance with Bobby's father.
Rogers exercises institutional power over Katherine, enforcing Limbo's strict regulations.
Raul serves as the professional trainer guiding Katherine through her initial supernatural duties.
Katherine acts as a protective guardian for Bobby, addressing his emotional and social struggles.
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