Jacob Portman is the main character in the novel series "Miss Peregrine's Home for Peculiar Children," written by Ransom Riggs. He is a teenage boy who discovers a mysterious orphanage and learns about children with unique abilities, known as "peculiars." Throughout the story, Jacob embarks on a journey to uncover the truth about his grandfather's past and the peculiar children. His character evolves as he faces challenges and learns to embrace his own peculiar abilities, ultimately becoming a key figure in the fight against dark forces threatening the peculiar world.