Which character is introduced in Red Dragon?

In "Red Dragon," the first book in Thomas Harris's series featuring Hannibal Lecter, the character introduced is Will Graham. He is a former FBI profiler who has the unique ability to empathize with serial killers, which allows him to understand their motives. Graham is brought back into the field to help capture a new murderer known as the Tooth Fairy, leading him to confront Lecter, who he previously apprehended. The dynamics between Graham and Lecter set the stage for the unfolding psychological thriller.