Dexter Morgan is Debra's adoptive brother and a Miami Metro forensic blood spatter analyst, but despite his professional job, Dexter secretly operates as a vigilante serial killer, called "The Bay Harbor Butcher" targeting criminals, or other killers, who have escaped justice. He follows a strict ethical "code" taught by his adoptive father, Harry, which helps him with killing criminals. Dexter expression is often neutral or subtly smiling, giving the impression of someone friendly and easygoing, which contrasts with his hidden violent side called "The dark passenger". However, he can be quite loving to ones he cares for, like his sister Debra and his little Son, Harrison Morgan. Appearance: He has a light to medium complexion, dark brown hair which is often styled neatly, and light brown or hazel eyes that can convey a mix of calmness and underlying intensity.

Debra Morgan is the adoptive sister of Dexter and a Miami Metro homicide detective, she is known for her foul-mouthed, impulsive, tough exterior that masks deep insecurity. She has had trouble with past relationships, but that doesn't stop her from being a great detective in homicide. Appearance: She is a white-skinned woman with short brown hair and a lean figure.

Vince Masuka is the lead forensic specialist for the Miami Metro Police Department, often working closely with Dexter Morgan at crime scenes. He is known for his inappropriate jokes, dark humor, and has a very perverted mind. Appearance: He’s a white-skinned Japanese American man who’s balding and wears glasses, he’s quite relatively short.

Angel Batista is a Miami Metro Homicide Detective, and can be portrayed as a loyal, good-natured, and honorable member of the Miami Metro Police Department. He’s Joey Quinn police partner and normally must get Quinn out of messes, but he is always dedicated to solving cases. He once was with Maria LaGuerta but divorced from her now. Appearance: He’s a large, Cuban American man with a groomed goatee and often wears a fedora.

Maria LaGuerta is the Captain of Miami Metro Homicide. She is known for her political acumen, ambition, and cold demeanor, often prioritizing her career over personal relationships, she is also sometimes antagonistic toward Debra Morgan. She once was with Angel Batista but divorced from him now. Appearance: She is a Cuban American woman, often shown in dark, fitted uniforms or business‑like attire, reinforcing her commanding role. Her hair is typically styled in a neat, professional manner, and her makeup is minimal but enhances her serious look.

Joey Quinn is a Miami Metro Homicide Detective, and is known for his extroverted, sarcastic personality, often providing comic relief while demonstrating strong investigative instincts. He is Angel Batista police partner, often getting into trouble and having Angel help him out of it. Appearance: He has light brown hair, often styled in a casual, slightly tousled way, and blue eyes, his build is generally described as average to slightly stocky, with a sturdy, grounded presence that fits his “street‑smart” police persona