Here are the main characters in "Poison":
* The Narrator: A man who loves his wife dearly but is constantly irritated by her nagging and domineering nature. He is the one who decides to poison her.
* The Wife: A demanding and critical woman who constantly complains about her husband's behavior and appearance. She is the victim of the poisoning.
* The Chemist: A mysterious and secretive man who sells the narrator the poison. He is described as "tall, thin, and cadaverous," with "piercing blue eyes."
* The Doctor: A doctor who is called to examine the wife after she becomes ill. He is initially suspicious of the narrator's actions, but ultimately is unable to prove anything.
While there are no other named characters in the story, other notable figures include:
* The narrator's mother: She is briefly mentioned and serves as a contrast to the narrator's wife, as the narrator describes her as "a quiet, gentle, loving woman."
* The narrator's friends: They are mentioned briefly and provide an external perspective on the narrator's marriage and his wife's personality.
It's important to note that the story is told from the narrator's perspective, and he is an unreliable narrator. His motivations and thoughts are presented without any direct challenge, and his account of events might not be entirely accurate.