Beware of spoilers, only spoilers from the seventh and eighth seasons are meant to be blacked out. All character sheets contain major spoilers. Proceed reading at your own risk.note
Rita's abusive, violent ex-husband and father of Astor and Cody.
- Adaptational Heroism: Heroism is definitely too strong a word, but television Paul is at least a loving father while his book counterpart (who was The Ghost and thus received little characterization) was specifically stated to have violently abused Cody and Astor along with Rita.
- Asshole Victim: To get him out of the picture without killing him, Dexter frames him for drug usage while on parole. Paul protests his innocence when he is sent back to prison, but no one buys it. He is eventually killed in a prison fight.
- Attempted Rape: After Paul leaves prison, he arrives to his house and tries to rape Rita, but she is able to fight back.
- Bitch in Sheep's Clothing: Tries to act nice and welcoming, but doesn't take long for him to get angry with Dexter and Rita.
- Cassandra Truth: Tells Rita about Dexter being a bad guy. She doesn't believe him obviously.
- Domestic Abuse: He beat and raped Rita while they were married, often coming close to killing her.
- Even Evil Has Loved Ones: His single redeeming quality is his love for his children.
- Foot-Dragging Divorcee: Paul blocks all attempts to finalize the divorce from Rita until she starts getting tough.
- Jerkass: He's a violent man and used to treat Rita very badly. The main reason why Rita idolizes Dexter as the perfect man is because she compares him to a Jerkass like Paul.
- Mirror Character: With Dexter, occasionally. Both exhibit a harmless facade (which Dexter is better at maintaining) but have violent impulses. Both of them care for the children.
- Mugging the Monster: Tries to intimidate Dexter. Doesn't work.
- Would Hit a Girl: As to be expected from a violently abusive husband.
A computer analyst who is arrested as a likely suspect in the Ice Truck Killer case. He later turns out to be a fake, hungry for fame.
- Big Bad Wannabe: In order to make a name for himself, he consciously obstructs a murder investigation by claiming to be the Ice Truck Killer.
- Freudian Excuse: As a child, he was regularly abused by his mother but did not retaliate. Considering that he mutilated her corpse immediately following her death, it is apparent that his relationship with her was not beneficial to his psyche.
- Small Name, Big Ego: He views himself as a sinister mastermind destined for fame when in fact he's little more than an unscrupulous poseur (albeit a violently unstable one)
- Villainous Breakdown: Once LaGuerta shows him a severed head, he starts crying like a baby and owns up that he is not the Ice Truck Killer.
Alfonso "Little Chino" Concepcion was a very big member of a gang called the Twenty-Ninth Street Kings who uses a machete to kill any witness of his gang's crimes. For every kill he makes, he has a teardrop of blood tattooed on his arm. Because of his massive structure and build, Dexter Morgan views him as the perfect target following his depressive state after the killing of his brother, Brian Moser.
- Asshole Victim: An enforcer for a Latino gang who has no problem killing women who get in his gang's way and tries to kill a young kid before Dexter stops him.
- Authentication by Newspaper: Blatantly uses this to create an alibi.
- Beard of Evil: A thin goatee.
- The Brute: He's the chief enforcer for a Hispanic gang. While he's not as dumb as his size would indicate his value to them stems largely from his strength and willingness to commit violent acts.
- But for Me, It Was Tuesday: Inverted. He makes a point to mention to never have killed a kid like the one in one of the photos Dexter shows him, Dexter points out the kid was still one of his victims because he ruined his life by killing his mother. (Not too mention when Dexter caught him he was about to brutally murder a kid for snitching.)
- Cut Himself Shaving: The excuse he gives Doakes for his wound caused by Dexter.
- Deadpan Snarker: Snarks at the police, knowing they don't have evidence on him.
- Ironic Nickname: "Little" Chino is quite massive.
- Karma Houdini Warranty: "It's Alive!" ends with him escaping from Dexter. The following episode, "Waiting To Exhale", ends with Dexter killing him.
- Karmic Death: Stabbed with his own trademark machete.
- Machete Mayhem: Machetes are his weapon of choice.
- Serial Killer: Personally responsible for at least ten murders.
- Smug Snake: During his police interview. They know he's guilty, he knows they know, and delights in knowing they can't prove anything.
- Tattooed Crook: He gets tattoos for all his victims.
- Would Hurt a Child: He tries to kill a young witness.
Carlos Guerrero is featured as a major antagonist for Sergeant James Doakes, one of the main characters for that season. Dexter Morgan originally investigates Guerrero but decides that his world is not one that he needs to participate in (he'd rather just stick to other killers). Regardless of that fact, Guerrero is still someone that deserves to be on Dexter's table.
- Bad Boss: Unless something can actually be traced to him, he's calm as can be when one of his henchmen is arrested...but to keep them from talking, he's quick to have another assassin kill them. This shows that he's exactly what a drug kingpin on top of the world would be like...he's arrogant, thinks he's above the law and capture, and cares nothing for his subordinates.
- The Don: He's this for his drug ring in Miami.
- Even Evil Has Loved Ones: Like some drug lords, he does place his loyalty in family and especially his daughter who he cares for severely.
A violent drug dealer who also killed Dexter's mom. Dexter makes his end extra gruesome.
- Asshole Victim: He butchered Dexter's mother and several others with a chainsaw in front of two young children.
- The Bartender: Of a small bar where Dexter finds him.
- But for Me, It Was Tuesday: He has no idea who Dexter is when they meet. Justified, as Dexter was a young child when Santos killed his mother and he does remember Laura Moser when prompted.
- Karmic Death: Killed in his drug cabin by the son of his victim with the weapon that killed said victim's mother.
- Retired Monster: A violent drug dealer who still moves a little coke on the side.
A young reporter who forms a relationship with Quinn while pumping him for information. She's later revealed to be Arthur Mitchell's daughter from a previous relationship, and Lundy's killer.
- Ate Her Gun: She commits suicide by sticking her gun into her mouth and blowing her brains out.
- Broken Bird: She's consumed with guilt over killing Lundy and obsessed with earning her father's approval. By the time she dies, Christine has become a shuddering, teary-eyed wreck.
- Daddy's Little Villain: Everything she does is for her father, Arthur. He would prefer is she didn't meddle, because she puts his cover in danger. He gets furious when she tells him she tries to protect him.
- Driven to Suicide: With the police closing in and Arthur having abandoned her, she shoots herself.
- Manipulative Bitch: She uses her sex appeal to seduce Quinn into divulging important details regarding police investigations in order to protect her father, Arthur Mitchell. She also gets a few hot news and exclusive articles.
- Ms. Fanservice: She has plenty of nude moments and explicit sex scenes.
- Nice Job Fixing It, Villain!: Her murder of Lundy and shooting of Debra put Dexter, and later Miami PD hot on Trinity's trail, leading to his death at Dexter's hands. Ironic that she killed Lundy to protect Arthur.
- The Ugly Guy's Hot Daughter: Nobody guessed she could be the daughter of Arthur.
- Smug Snake: She puts this on for her police interview, mocking Debra and staying impassive.
- "Well Done, Daughter!" Girl: Towards Arthur, AKA The Trinity Killer. She protects because she wants his serial killer approval.
- Yandere: For her father. She takes it very badly when he even slightly criticizes her.
A pair of meth-addicts who began robbing and killing tourists.
- Asshole Victim: Johnny Rose not only committed violent murders, he also cheated on his girlfriend who was helping him with them.
- Ax-Crazy: When Nikki gets arrested, she's out of her mind on meth, hallucinating that Johnny is still alive and ranting about how they were going to go to Bermuda.
- Love Forgives All but Lust: Nikki had no problem robbing and murdering tourists with Johnny until she found out he was cheating on her.
- Outlaw Couple: The two of them rob and kill people so they can use their money to go to Bermuda together.
- Sanity Slippage: Nikki is arrested while out of her mind on meth, ranting at Johnny's corpse about going to Bermuda.
- Villainous Breakdown: Nikki suffers one, combined with Sanity Slippage, after finding out that Johnny was cheating on her. She shoots him dead, runs out into the street and starts ranting about how they were going to Bermuda, all while hallucinating that Johnny is still alive and talking to her.
A highly skilled cop who killed her daughter, husband and the crook she framed for the job.
- Aren't You Going to Ravish Me?: Suspects that Dexter has this planned along with killing her. Dexter of course, only has the second goal in mind.
- Asshole Victim: She kills her family because she wants some space, frames and then kills a random guy and threatens to frame Dexter for rape and shoot him in cold blood when he investigates her.
- Bitch in Sheep's Clothing: She's friendly to Dexter during the house opening, but it's clear to both Dexter and the audience that this is just a façade.
- False Rape Accusation: She tells Dexter that she would claim he attempted to rape her, which would justify killing him in a gas station when she confronted him. Dexter points out that the method that she would do it would only end up raising more questions, which causes her to back down.
- It's All About Me: Murdered her husband and daughter because she simply grew tired of them and wanted her own space.
- Karmic Death: Killed in her daughter's room.
- Killer Cop: She's a police officer who resorted to murdering her own family, and hiding the crime by killing the main suspect, after she got bored with them. Her professional experience made her considerably more difficult to take down for Dexter.
- Mater Familicide: She offed her daughter and husband just because she was tired of them.
- Mirror Character: When researching her life, and speaking to her before he kills her, Dexter realizes that the main concern with her old life; being trapped by the demands of others, is the same problem he is facing. However, during the killing ritual, Dexter realizes despite this, he rather have his family than lose them.
- Mugging the Monster: She finds out Dexter is investigating her and assumes he is a harmless lab geek in over his head, thinking she can kill him. Needless to say, she is very wrong.
- Offing the Offspring: She murdered her young daughter.
- The Sociopath: Manipulative and charming with no regard for anyone but herself. When Dexter asks her why she killed her husband and daughter in their own beds, she explains that it was so she could be free of care again.
- Would Hurt a Child: She killed her own child who was still a very young girl.
- Worthy Opponent: To Dexter. He really enjoys hunting her in a little cat-and-mouse game.
A pair of criminal brothers, known for murdering their enemies with machetes.
- Boom, Headshot!: Carlos is shot in the head by Debra.
- Chuck Cunningham Syndrome: After "Circle Us", they are never seen again. Justified with Carlos, who is dead, but Marco is still alive and at large and yet the department just stops looking for him after he escapes.
- Evil Is Petty: What's their master plan that necessitates brutal murders of innocent people? Get enough money to pay for VIP membership of a club.
- Hot-Blooded: Carlos is very violent and easy to anger...when Cira Manzon rejects his advance, he quickly becomes angered and both brothers pull out their firearms, killing an associate of theirs (Yasmin Aragon) and attempting their escape..
- Karma Houdini: Marco escapes following Carlos' death.
- Put on a Bus: After Carlos is killed, Marco disappears from the series and is yet to be seen again.
- The Quiet One: Marco, who has no speaking role.
- Serial Killer: They kill and mutilate several people.
A Dirty Cop who is recruited by Quinn to investigate Dexter. However, he quickly gets out of control...
- The Alcoholic: Liddy drinks tequila heavily almost any time he appears onscreen, and at one point invites Quinn out for a beer... at 7:00 in the morning.
- Asshole Victim: Dexter kills him partly out of self-defense, as Liddy is preparing to torture him to extract a confession.
- Deadpan Snarker: With great frequency, spouting off one-liners in his appearances.
- Dirty Cop: He was fired from the force for corruption, ruining his pension in the process.
- The Dragon: To Quinn, at first, who hires him to dig up dirt on Dexter.
- Dragon Ascendant: After Quinn tries to back out, he decides to use Dexter to get his job back, make a name for himself and embarrass his ex-employers.
- Evil Old Folks: Despite his age, he still outwitted and tased the hell out of Dexter. He was close to retirement when he was fired for corruption.
- Four Eyes, Zero Soul: He's sometimes seen with a pair of reading glasses.
- It's All About Me: All he cares about is being seen as a hero and being vindicated of his Dirty Cop status, even if the methods he uses are plenty dirty.
- Jerkass: He's a crude, snarky and corrupt old bastard who looks out for himself.
- "Shaggy Dog" Story: After a season spent watching Dexter Dexter kills him while he tries to torture a confession out of him and nothing comes of Quinn being accused of the murder.
- Smug Snake: When he's nabbed Dexter, he's utterly thinks he's won, taunting him.
- Wild Card: Quinn very quickly realizes he can't be controlled. He soon stops following Quinn's orders once he starts to think that Dexter could be a big catch.
A drug-addicted ex-convict who Brother Sam attempts to redeem. It doesn't work.
- Asshole Victim: He killed Brother Sam and showed no remorse about it. No wonder Dexter wanted to drown him.
- Death by Irony: Dexter drowns him at the same beach where Brother Sam had him baptized.
- Kick the Dog: He first appears to be a Sympathetic Murderer, and it looks like Dexter will spare him at Brother Sam's request. Then he starts laughing about how he got away with everything.
- Redemption Rejection: Twice. First when Brother Sam tries to turn him into a good man, and again when Dexter offers him forgiveness for killing Sam. The second time gets him killed.
- Sympathetic Murderer: Subverted. At first it looks like he's genuinely sorry for shooting Brother Sam, but then he finds out that Dexter doesn't intend to go to the police and it's revealed it was all just an act.
- Tempting Fate: "I can't believe how well this worked out!"
- Ungrateful Bastard: Brother Sam only tries to help him, and Nick shoots him for his trouble.
A groundskeeper at a cemetery who kills women and keeps their earrings as trophies. Likes to hunt his victims in some sort of a Saw-like maze using a bullhorned helmet before killing them.
- Asshole Victim: Speltzer is a psychotic maniac who traps women in mazes and hunts and kills them. He's also an enormous Smug Snake who mocks Deb when she's unable to charge him and attends the funeral of his victim to mock her grieving relatives. Dexter killing him is what gets Deb to accept that what Dexter does is necessary.
- Creepy Souvenir: He keeps the earrings of his victims.
- Disposable Sex Worker: His usual victims are prostitutes, partly because they're easier to lure into his home but also because they disgust him as much as his mother did when she brought over customers.
- Dumb Muscle: He's a steroid popping body builder strong enough and tough enough that it takes four cops to bring him down... but he's considerably lacking in the brains department compared to Dexter's previous adversaries (The Ice Truck Killer, Trinity, etc.).Dexter: Speltzer may have a lizard brain like me, but his shortcoming is he doesn't have much of a human brain.
- Freudian Excuse: As a child, he was traumatized by the experience of having his mother bring "customers" home while she earned money as a prostitute. So, every time he invites a girl home and she complies, he is reminded of his mother.
- Hunting the Most Dangerous Game: With a bullhorned helmet no less.
- Serial Killer: He murders multiple women in his maze.
A serial killer who burns people alive before leaving behind the name 'Bobby' at the crime scene. His real name is Joe Jensen.
- Ax-Crazy: Repeat; Serial Killer who burns people alive.
- Chekhov's Gunman: He is introduced as an unsuspecting janitor called in for questioning merely to ascertain whether he witnessed any suspicious behavior at the scene of the crime where he worked.
- Creature of Habit: Leaves the scrawled message , " It was Bobby" at all the scenes of his crimes.
- Enfante Terrible: He nearly burned down his school when he was only 12 years old.
- Insane Troll Logic: He attributes blame for all his murders to his childhood friend, Bobby, who died 14 years ago.
Hannah's cruel and abusive father.
- Abusive Parents: He was quite abusive of Hannah. No wonder she ran away at an early age.
- The Atoner: Subverted as he says he's trying to atone for his past mistakes, but really he's just after more money.
- Bitch in Sheep's Clothing: Very polite and affable at the start until Hannah refuses to give him money.
- Blackmail: What he tries against Hannah.
- Dirty Coward: He shamelessly abuses his own daughter for purposes of extortion and/or for his own amusement. However, he pleads for his life when he realizes Dexter is about to kill him.
- Dirty Old Man: He shamelessly leers over Jaime, making her uncomfortable.
- The Gambling Addict: One of Hannah's earliest memories of him is how he left her in a hotel room for at least 3 days while going on a gambling binge. Additionally, the sole reason he tries to reconnect with Hannah in "The Dark....Whatever" is to obtain money to pay his gambling debts (presumably so he can repeat the cycle all over again).
- Kick the Dog: A lot, anything that have to do with Hannah.
- Lack of Empathy: It becomes clear that he has no regard for any one or anything aside from himself and harbors no shame for the pain and suffering he's left in his wake. He even tries to extort money from his own daughter without the slightest hint of remorse.
- Manipulative Bastard: He callously exploits any lingering affection his daughter has towards him for all it's worth.
- Only in It for the Money: The entire reason he seeks out Hannah is to get cash from her; he's spent a long time making money off her 'fame'.
- The Sociopath: His "talents" as a con man are due in large part to his complete indifference to the well-being of those around him including his own daughter, Hannah, whom he routinely manipulates and abuses to get what he wants. Additionally, he has a pronounced lack of impulse control as evidenced when he almost immediately drops his kindly demeanor and explodes into a rage when Hannah expresses reluctance over giving him money. Furthermore, he shows a highly pronounced sadistic streak if his abusive treatment of Hannah as a child and undisguised ogling of Jaime is any indication.
- We Hardly Knew Ye: He only appears in one episode before being dispatched by Dexter.
A Drug Kingpin and the man who ordered the death of Dexter's mother.
- Asshole Victim: A crime lord who ordered Laura Moser to be butchered in front of her children.
- The Bait: Used several times as an unwitting lure in Season 7.
- But for Me, It Was Tuesday: Recalls the killing of Laura Moser but doesn't remember Dexter's name, referring to him as 'Dickie Moser'.
- Even Evil Has Loved Ones: He's still in contact with his wife, who wears her wedding ring decades after he went to prison.
- Greater-Scope Villain: If he hadn't had Laura Moser killed, Dexter wouldn't have grown up to be a serial killer and the entire show wouldn't have happened.
- Small Role, Big Impact: Hector is debatably Dexter's most important kill in the series, following Santos Jimenez (who was directly responsible for Laura's death), though he killed her under coercion from Hector, making Hector the most urgent kill in the series, because of the trauma he inflicted on both Dexter and his brother Brian Moser's lives.
- You Killed My Father: Dexter's life goes full circle when he finally avenged his mother.
A wealthy international casino owner who is married to Hannah McKay in Season 8.
- Asshole Victim: He is controlling, jealous and obsessive, has Dexter threatened and beaten up and tries to rape Hannah. Killing him costs her no sympathy.
- Attempted Rape: He tries to force himself on Hannah, which gets him killed without Dexter having to lift a finger.
- Bitch in Sheep's Clothing: At the beginning of their marriage, Hannah initially believed him to be a very generous man after he provides her with a false identity to elude authorities and lavishes her with all the luxuries his money can buy. However, he ultimately reveals himself to be a violently possessive egomaniac hellbent on dominating every aspect of her life.
- Crazy Jealous Guy: He is extremely possessive of Hannah to the point of having her followed wherever she goes and having Dexter brutally beaten after learning that they met with one another in secret.
- Control Freak: He has Hannah followed and wants to control every aspect of her life.
- Fiction500: His wealth is revealed to be at least in the millions.
- MayDecember Romance: With the much younger Hannah.
- We Hardly Knew Ye: He only appears in one episode before being killed by Hannah.
Albert J. Yates (or simply "A.J.") was a former patient of Dr. Evelyn Vogel, he worked as an all-around electronics technician specializing in cable, internet, and other appliances for Solray Communications. In his spare time, however, he was shown to be a very careful and paranoid individual with various security cameras situated inside of his house, to protect his "secret".
- Abusive Parent: His mother; he hid under the bed to get away from her, but she'd always find him.
- Asshole Victim: He's a Serial Killer of women and we're led to believe he's the Brain Surgeon, so Dexter impaling him with a curtain rod is extremely satisfying.
- Crazy-Prepared: His home is wired with security cameras.
- Disc-One Final Boss: Initially, the show is led to believe he is the brain surgeon, but is later shown not to be.
- Impaled with Extreme Prejudice: With a curtain rod.
- Mommy Issues: His mother was horrifically abusive to him, leading him to be a killer of women.
- Red Herring: Is not the Brain Surgeon.
- Serial Killer: He takes women home and breaks their toes before murdering them.
Javier Guzman is a hitman who goes by the alias "El Sapo" and targets Andrew Briggs after Briggs robs a jewelry store owned by Guzman's employers.
- Asshole Victim: He's a hitman trying to kill Deb's boyfriend so killing him costs her no sympathy.
- Professional Killer: Deb thinks he is a Fence when he turns out to be this.
- Punch-Clock Villain: Won't kill unless he is assigned a target. He even looks annoyed at Deb constantly trying to attack him and is forced to hit her.
- Surprisingly Sudden Death: Killed by Deb in a fit of rage by shooting him once in the head and twice in the chest.