Angel is a fellow homicide detective who shares Dexter’s meticulous nature and works closely with him on forensics cases.
Harry is a street-wise police detective who spotted young Dexter’s passion for human vivisection and helped his son channel his homicidal impulses in a more constructive pursuit: the deliverance of vigilante justice. Morgan taught him to blend into the “normal” world by day and use his “talents and interests” in a constructive way at night by eliminating heinous perpetrators who think they’re above the law or who may have slipped through the cracks of justice.
Debra, Dexter’s step sister is a tough, ambitious cop who is desperate to become a homicide detective in spite of constant antagonism from her boss, the head of the division.
Rita is Dexter’s sweet, naïve and emotionally downtrodden girlfriend, a struggling single mom with two kids. To Dexter, Julie is a kindred, damaged spirit and the two form a sweet courtship that provides a strange sense of normalcy in his upside-down world.