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
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Isaak Sirko
"A shame really, under different circumstances, I think we could have been great friends."
Played by: Ray Stevenson
"We're outsiders, you and I. On the periphery. Watching everybody else. Pretending we're just like them, but knowing we're not. Best we can hope for is to find a place where we don't have to pretend."
A high-ranking member of the Ukrainian Mob who comes to Miami to survey his business interests there and avenge the loss of one of his most loyal subordinates. He and Marie LaGuerta serve as the principal antagonists in Season 7.
- Affably Evil: Incredibly polite and charming most of the time. Steers towards Faux Affably Evil when he starts to rack up the body count, as when he politely threatens to drill a guy's eyes in and then kills him anyway or rams a screwdriver inside a guy's eye while soothing him. He even lampshades his status in a discussion with Nadia the stripper.
- Alas, Poor Villain: Even Dexter feels sorry for him in his final moments alive, and he gets one of the most tearjerking sendoffs on the entire show.
- Anyone Can Die: A notable example in that unlike the average big bad, he kicks the bucket well before the season finale.
- Badass in a Nice Suit: Always dressed well.
- Benevolent Boss: He appreciates Jurg's loyalty and even offers him two seperate chances to leave him.
- Best Served Cold: His grandfather, but he seems to imply that a couple of decades aren't gonna weaken his resolve to get his vengeance.
- Big Bad Ensemble: with Marie LaGuerta for Season 7. After arriving in Miami, he becomes the greatest threat to Dexter and his loved ones.However, LaGuerta replaces him as the story arc's preeminent antagonist for the rest of the season after he meets his end three episodes before the season finale.
- The Chessmaster: Aside from getting clues against Dexter very quickly, he is a cunning psychologist.
- Cold-Blooded Torture: The tools he brings to Dexter's house show he was ready to inflict one, but his plans are thwarted.
- Cultured Badass: He has a love of music and opera.
- Deadpan Snarker: Can go toe-to-toe with Dexter in this department.
- Disc-One Final Boss: Ultimately revealed to be this after he is killed off three episodes before the finale.
- Disproportionate Retribution: Against his old music teacher who he pushed down some stairs for giving him a failing grade.
- Dissonant Serenity: Always keeps his cool, especially when he murders people.
- Enemy Mine: Sides with Dexter to kill the hitmen chasing him.
- Even Evil Has Loved Ones: Genuinely loved Victor. Was quite shaken up when Dexter lovingly described how he killed Victor.
- Evil Genius: Clearly the brains of his operation.
- Eye Scream: Gives one to an ex-employee...with a screwdriver.
- Face Death with Dignity: After being shot, he gently requests that Dexter take him out on the water so he can die quietly and be with Victor. He even gives Dexter some last advice.
- Gayngster: He eventually comes out of the closet to Dexter. While in a gay bar.
- Genius Bruiser: Clearly a smart guy and an Implacable Man.
- Go-Karting with Bowser: Shares a deep life exploration with Dexter in a bar.
- Heartbroken Badass: His actions are motivated by his grief at Viktor's death.
- I Gave My Word: He didn't shoot Dexter when he had him at his mercy, once the hitmen are dead.
- I Have Your Wife: Invokes this to force Dexter into his side against two hitmen.
- Implacable Man: The cops compare him to The Terminator when they discover the crime scene.
- It's Personal: His reason for chasing Victor's murderer, a.k.a. Dexter.
- Living Lie Detector: Instantly spots when Dexter lies.
- The Mafiya: He's a high-ranking member of the Koshka Brotherhood, a Ukrainian crime syndicate that has a few operations in the USA.
- Noble Demon: He has a sense of honor, usually keeping his word.
- Not Even Bothering with the Accent: Handwaved; he speaks with Ray Stevenson's own British accent, which is explained away as the result of his spending most of his childhood in a British boarding school.
- One-Man Army: Dexter dumps him in a room with mortal enemies that outnumber him, but he takes out every single one. Miami Metro are in awe of this.
- Pet the Dog: After telling a barman to commit suicide, he promises that he will make sure the barman's family gets anything they want.
- "The Reason You Suck" Speech: To a Colombian who threatened him in jail. Doubles with Eviler than Thou.
- Revenge Before Reason: His vendetta is not good for the business. Also gets him killed. Surprisingly not by Dexter.
- Sharp-Dressed Man: Aside from his brief stint in prison, Isaak is always well turned-out in nice suits.
- Shoot the Dog: Forces a loyal barman to commit suicide to make the Police stop its investigation regarding Mike Anderson's death.
- Straight Gay: He has no gay stereotypes about him, being a pretty rugged yet well-dressed ace who kicks copious amounts of ass.
- The Sociopath: At first he gives off this impression, killing with no hesitation or remorse and relating a horrible story about almost killing his piano teacher as a child. Ultimately subverted: everything he does, he does out of love, grief and a sense of personal guilt.
- Tragic Villain: Towards the last two episodes, when he's revealed as a lonely, closeted man who's lost the love of his life and is hunted by his own people.
- Worthy Opponent: Isaak and Dexter slowly gain a growing respect for each other, acknowledging the other as having very formidable skills.
- Wicked Cultured: He's a fan of opera.
- You Can't Go Home Again: After the bosses back home put a hit on him.
George Novikov
Played by: Jason Gedrick
The manager of Isaak's US strip clubs.
- Alcohol-Induced Idiocy: He drunkenly threatens Quinn and Nadia with a gun.
- Bad Boss: He treats his strippers like cattle and has no problem offering up his employees to die.
- Big Bad Wannabe: He's not entirely pleased when Isaak, the bigger fish, comes to America and casually orders him about. He eventually shoots Isaak, with a view to one day taking his place.
- Blackmail: How he manages to play Quinn like a fiddle.
- Bullying a Dragon: Gets killed by Quinn after pushing him to far. You'd expect him to be smarter than that.
- Deadpan Snarker: He enjoys making snide remarks at Quinn's expense.
- Honest Advisor: He tells Isaak what he doesn't want to hear: that Viktor was impulsive and hot-headed.
- Kick the Dog: Shoots Isaak in the stomach and is about to shoot him in the head when he stops and goes away electing him to suffer and die slowly from bleeding out.
- No-Holds-Barred Beatdown: Quinn finally snaps and beats the ever loving shit out of him.
- Pragmatic Villainy: Opposes Isaak's vendetta against Dexter because it's bad for business, as it would bring even more attention from the law.
- Slimeball: He's horribly sleazy, making his strippers sleep with him.
- Smug Snake: He's not nearly as charming or smart as he thinks he is.
- The Starscream: He convinces the Koshka higher-ups to put a hit out on Isaak, and when that ends badly, George kills Isaak himself.
- Too Dumb to Live: Foolishly confronts an enraged Quinn, death ensues, in no small part thanks to Alcohol-Induced Idiocy.
Jurg Yeliashkevych
Played by: Andrew Kirsanov
Isaak's bodyguard and aide.
- Asshole Victim: Hannah takes him out with food.
- Bald of Evil: He's coolly professional in his work, which includes kidnapping Hannah.
- The Dragon: He's Isaak's bodyguard and stays by his side.
- The Quiet One: He doesn't speak unless he's spoken to, and is pretty terse with Hannah.
- Sharp-Dressed Man: Always clad in a sharp suit.
- The Stoic: He rarely changes his expression.
- Undying Loyalty: To Isaak, sticking by him even after the Koshka's put out a hit on him.
Nadia (Nadezhda)
Played by: Katia Winter
A stripper and prostitute who works in George Novikov's bar. She enters a romantic relationship with Quinn.
- But Now I Must Go: After George dies, she leaves Miami and Quinn.
- Hooker with a Heart of Gold: A hooker, but is an extremely lovable and endearing person.
- Morality Pet: For Quinn, considering his numerous levels in jerkass in season 6.
- Nice Girl: She is an honest and sweet person.
- Put on a Bus: She suddenly drops away from the show without so much as a goodbye.
Viktor Baskov
Played by: Enver Gjokaj
A Ukrainian gangster who killed a stripper and Mike Anderson.
- Asshole Victim: He impulsively killed a stripper and Mike Anderson.
- Defiant to the End: When faced with Dexter, he's angry and shows no fear.
- Gayngster: He was in a relationship with Isaak.
- Get It Over With: What he says to Dexter.
- Living Emotional Crutch: Isaak stated that Viktor was the one and only person who could ever make Isaak feel like himself without being judged and with him dead, he has nothing left for himself.
- The Lost Lenore: For Isaak, who mourns him deeply and wants to be reunited with him in death.
- The Mafiya: A member of the Koshka Brotherhood.
- Undying Loyalty: Viktor was a very loyal member to the Brotherhood, as Isaak Sirko stated that he was a good man and was committed to his job and would never sell out his allies. This was proven true as he didn't tell Dexter anything about his allies.
Oleg Mickic
Played by: Karl Herlinger
An assassin for the Koshka Brotherhood.
- Affably Evil: He doesn't want to kill Isaak, and is pretty well-mannered. He just has a job to do.
- The Dreaded: Isaak notes him as one of the best.
- Even Bad Men Love Their Mamas: He has an ill mother, who he briefly speaks of with some resigned sadness.
- Friendly Enemy: To Isaak, who politely inquires about his mother.
- Professional Killer: He's hired by the Koshka's to take out Isaak.
Benjamin Caffrey
Played by: Sherman Augustus
An assassin for the Koshka Brotherhood.
- The Dreaded: Isaak notes that he's one of the best.
- Professional Killer: He's hired by the Koshkas to take out Isaak.
- Scary Black Man: Being a Professional Killer means you tend to be pretty scary.
