First, it’s important to make sure that you keep static and dynamic straight when you’re reading. Static characters are those who do not go through a change or transition throughout the text. Dynamic characters are the opposite; these are characters who have a change in personality or attitude as a result of the actions in the work.
Agatha Christie’s mystery And Then There Were None focuses on ten characters who have all committed a crime but for one reason or another have escaped any punishment. Throughout the course of the book, one by one, each character is murdered until no one is left. Guilt from their crime has cause several of the characters the change, thus being dynamic characters
Anthony Marston, the first to die, ran over two young children while he was speeding through the country roads. He feels no remorse for their deaths and dies having learned nothing from his actions. "I've just been thinking—John and Lucy Combes. Must have been a couple of kids I ran over near Cambridge. Beastly bad luck."
Emily Brent also shows no remorse for her actions. She kicked a young pregnant girl out of her house; having nowhere to go, the girl committed suicide. Emily demonstrates no compassion for the girl when she explains, "The abandoned creature, not content with having one sin on her conscience, committed a still graver sin. She took her own life."
Judge Wargrave, the mastermind behind the murders, is a static character. As a judge, he believes in justice at all costs. He feels no guilt for his actions, and his descriptions of the crimes leave a sense of pride in his work. However, still believing in the need for justice, he arranges his own death after everyone else has died.
Vera Claythorne, the last character to die, is the only one to die by their own hand. Vera was a governess to a boy, Cyril Hamilton. She fell in love with his cousin, Hugo, and so she developed a plan to have Cyril die so Hugo would inherit his money. One day when they were at the beach, she let him swim out too far; he became weak and drowned before anyone could reach him. As she walks upstairs to die, she sees hallucinations of Cyril and her love, Hugo. She says to herself, "You can go to the rock, Cyril. That was what murder was—as easy as that! But afterwards you went on remembering . . . .”
Dr. Armstrong is also a dynamic character. He admits that he was an alcoholic and killed a patient because he operated on her while inebriated. He admits to himself, “Nerves all to pieces—hands shaking. I killed her, all right. Poor devil—elderly woman—simple job if I'd been sober.” However, the guilt sobers him up, and ever since, he has tried to lead a good life.