The character development in "Metamorphosis" centers around the transformation of the protagonist, Gregor Samsa, into a giant insect. Throughout the story, Gregor's physical transformation is paralleled by his emotional and psychological transformation. At the beginning of the story, Gregor is a dutiful son and a hardworking employee, but he is also unhappy and unfulfilled. After his transformation, Gregor is ostracized from society and becomes increasingly isolated and depressed. As the story progresses, Gregor's family members begin to resent him and eventually turn on him, leading to a tragic and lonely end. Ultimately, the story is a commentary on the human condition and the fragility of our sense of self in the face of adversity.