As of the end of Season Three, major changes happen to the cast that affect the entire continuity of the show; spoilers will be unmarked. YOU HAVE BEEN WARNED. Beware: only developments of the newest season will be spoilered. (Right now, that's Season 6.)
Dr. Alan Deaton (portrayed by Seth Gilliam)
Veterinarian, owner of, and Scott's boss and father-figure at the Beacon Hills Animal Clinic. It's revealed he's well aware of the supernatural underworld after Scott is Bitten. Alan later provides assistance and much-needed guidance to Scott and his allies on the latest supernatural problem.
It's revealed in Season 3A he's known as an Emissary, a Druid practitioner who acts as an advisor to werewolf Packs and was this to Talia Hale, Derek's mother, before the Hale fire. Later, he brings himself out of retirement to step up and assist Scott and his Pack.
- Actual Pacifist: In the past, he worked to keep the peace between the werewolf Packs and hunters acting as a messenger, and admired the then-benevolent Alpha Deucalion's willingness to extend an olive branch. Though he will take actions to defend himself and innocents if the those actions prove necessary.
- Badass Bookworm: Alan knows far more about the supernatural than you would think at first glance, including how to modify their behavior, how their own nature affects them, to keep them under control and advice on how to master their different abilities that they aren't even aware of. Must be required when being an Emissary.
- Badass Normal: He's shown great skills in hand-to-hand combat, putting up a fight against Oni and holding himself well until he's slashed.
- Battle in the Rain: A friendly one: The Alpha Satomi greets him like this at the beginning of "Weaponized" with his baton against her emei dagger.
- Big Brother Instinct: Towards Marin Morrell, calling her out on her decision to be Emissary to the Alpha Pack. Also:Kali: Help us. (Claws Marin's hair back). Or maybe I just kill her.
Deaton: Not here you won't. (Kali's transformation melts away.) I suggest you leave. Don't make me insist.
- Big Damn Heroes: In Season 4 "A Promise To The Dead", when saving an innocent woman from a Wendigo Patrick Clarke and his "culinary practices".
- Commuting on a Bus: He isn't seen much in Seasons 4 and 5, due to the actor playing Father Gabriel Stokes. In 6A, he seems to have been entirely Put on a Bus, after a brief appearance in Episode 2.
- Dark and Troubled Past: He was Talia Hale's human confidante, but retired presumably after the fire killed her and most of her family.
- Druid: Was formerly the Emissary to the Hale pack. Now, despite being retired, he is the main source of wisdom whenever Scott and his Pack needs info on a new supernatural problem.
- Insistent Terminology: Whatever you may think, he's just a vet.
Isaac: What are you, some kind of witch?
- 2x08 Raving:
Deaton: No, Im a veterinarian.
Kalissa: Are you - are you a cop?
- 4x11 A Promise To The Dead:
Dr. Deaton: Veterinarian.
- The Fettered: Alan always conforms to his ideals and always steps up to treat any injured supernatural, whether they had spilled innocent blood or not. He even treated the brutal, amoral Alpha Ennis (though the others had to pressure him into doing so by threatening to go after Scott at first). Except, it was all for nothing in the end.
- The Lost Lenore: Though initially reluctant because of Derek's behavior, he assists and supports Derek due to a promise he made to Talia. He later admits his feelings were more than friendship:Deaton: I need to know what she did to Derek Hale. And if he's dying.
Deaton: Because of a promise I made to the woman I loved.
- The Medic: He's an expert in treating and healing werewolves or other supernatural creatures due to his druid skills. In Beacon Hills, Alan is the go-to guy when it comes to injured supernaturals and injuries caused by any means supernatural. However, he does also treat pets in 90% of his time. Melissa joins him in this role in later seasons.
- Nerves of Steel: Alan never loses his cool, even when an alpha who's a murderer is trying to get into the veterinary clinic, when fanatical hunters enter his clinic, when he's held at gunpoint by a Japanese mobster, when Oni come to attack him, or when he is interrogated by a ruthless supernatural assassin.Deaton: Let me make myself clear. We. Are. Closed!
- Parental Substitute: To Scott, again. He's far more of a father to Scott than his biological dad as Stiles has said, and he was Scott's Tether when Scott undertook a Human Sacrifice ritual - a person to pull Scott back.
- Retired Badass: He was previously a druid emissary, but after the Hale fire he became a vet. He retains a lot of the skills and information, though, and after the end of season 2 takes a much more active approach to helping Scott and his Pack.
- Team Dad: To Scott's Pack and their allies from Season 3A onwards. Later on, Sheriff Stilinski and Chris Argent come to share the role with him.
- Thou Shalt Not Kill: It's clear this is where Scott gets it from.
Marin Morrell (portrayed by Bianca Lawson)
Marin Morrell is a woman of many traits. Aside from being a French teacher and Guidance Counselor at Beacon Hills High, she is also a resident psychologist at the Eichen House sanatorium.Also, as a druid, she moonlights as the emissary of the dreaded Alpha Pack when they are in town. Being an all-around badass runs in her family, as she's Alan Deaton's younger sister.
- Action Girl: She can go hand-to-hand with Allison on equal footing.
- All Therapists Are Muggles: Inverted in Lydia's case as she receives counseling from her having no idea her problems are supernatural in origin, and subverted when Stiles tries to edit out the werewolf element of his problems because he doesn't know she's already aware of the supernatural world.
- Badass Bookworm: She can go toe-to-toe with hunters, and she has over 300 hours of field work and a masters degree in behavioral psychology.
- Chuck Cunningham Syndrome: Appears once in Season 3B, and has not been seen since.
- Druid: Like her brother, she is a Druid, and sometimes acts as an emissary to werewolf packs. She's also a source of great knowledge, but prefers to be even more mysterious than Deaton when handing it out.
- FaceHeel Turn: Inverted. She becomes the evil Alpha Pack's Druid emissary in Season 3A, although it's all in the name of balance - this way, she can make sure they get fair representation and cannot do too much damage. Turns out this is a good thing.Marin: (To Scott) Truthfully, I'm all that stands in the way between Deucalion and the lives of your friends. I'm the one who's been pulling the leash taut when they're salivating for a bite.
- Good Is Not Nice: There's little doubt she's on the lighter side of things, but rest assured, if you're possessed by an evil spirit and it takes you over, she will kill you.
- Nerves of Steel: Seems to be a trait that runs in her family. She's the Druid Emissary to the Alpha Pack - formidable, ruthless Alpha werewolves - all of whom have murdered all of their own previous Packs! She keeps her cool even when Kali suggests killing her to force Alan to treat an injured Ennis.
- Sixth Ranger Traitor: To the Alpha Pack.
Braeden (portrayed by Meagan Tandy)
Braeden is a former US marshal, and mercenary active in the supernatural world who frequently takes on dangerous jobs to make a living.
Saving, and assisting members of Scott's Pack multiple times, Braeden is an irreplaceable ally to them and the romantic interest of Derek Hale. She is currently hunting for a wanted supernatural assassin: the Desert Wolf, Malia's biological mother.
- Action Girl: Takes out human hunters easily and doesn't hesitate to engage in combat even with dangerous supernaturals.
- Ascended Extra: Originally a mysterious fighter hired by Morrell to save Isaac from the Alpha pack, she seemingly dies at their hands after one episode. When she returns in 3B, she still bears a huge scar from the incident.
- Back-to-Back Badasses: With Derek against the rogue hunters in 'Monstrous.'
- Badass Normal: As a human, she has to rely on weapons, intelligence and fighting skills, but isn't shy to take on werewolves and even berserkers.
- Beauty Is Never Tarnished: Deucalion may have almost killed her for interfering in his affairs, but he did make sure not to mar her face.
- Biker Babe: She owns a black motorbike and commonly wears leather.
- Bodyguard Crush: Develops one on Derek, which he reciprocates.
- Brutal Honesty: When Scott asks Braeden if she'd be willing to kill Kate for the right price, she replies that she'd kill him for the right price.
- The Bus Came Back: Returns in "Status Asthmaticus," the midseason finale of Season 5.
- Dark and Troubled Past: She used to be a U.S. Marshal until the obsession with catching the Desert Wolf forced her to give up her job.
- Good Scars, Evil Scars: Clashing with the Alpha pack left her with a nasty throat scar. It does make her look pretty badass.
- Not Quite Dead: Was presumed dead for the first half of season 3, courtesy of maiming by Deucalion, until she showed up in "More Bad Than Good" to save Derek and Peter from the Calaveras Family.
- Only in It for the Money: She claims that it is her reason for taking on cases, but she's been helping people often enough to hint that this is not quite true.
- Private Military Contractors: She's a mercenary, and pops up in the story because of people paying her such as Morrell, the Calaveras.
- Put on a Bus: In Season 5A, she seems to be traveling in search of the Desert Wolf, and communicates with Scott's Pack. She returned for 5B, but seems to have boarded the bus again in 6A.
- Scars Are Forever: She has a nasty throat scar from surviving Deucalion's attack in Season 3A.
- Smash Sisters: With Malia in Season 5.
- Teacher/Student Romance: When Derek is Brought Down to Normal in Season 4, she gives him lessons in using firearms and hand-to-hand combat and start a relationship immediately.
- U.S. Marshal: Formerly, her obsession with finding the Desert Wolf ended her career. In the present day, she poses as a U.S. Marshal as a cover for her missions.
Mr. Lahey (portrayed by John Wesley Shipp)
Isaac's father, the school's former swim coach, and now the manager of Beacon Hills Cemetery. Lahey was abusive to Isaac, setting his son off to become part of Derek's Pack and acquire the strength and confidence he lacked. He is murdered by the Kanima at the beginning of Season Two.
- Abusive Parents: And he is. He used to lock Isaac in a freezer for the most minor of mistakes or offenses. The very container became Isaac's worst nightmare - figuratively and literally. Throwing cutlery at and in front of his son and he sends Isaac a warning glare to say he got his black eye from 'school' playing lacrosse to the Sheriff. But surprisingly he used to be a ...
- Cool Teacher: A cool coach to be exact. He was the coach for the Beacon Hills High Swim Team in 2006 of which his older son Camden was a member. They'd won state championship and had a pool party to celebrate and he let them drink alcohol.
- Kick the Dog: The way he mistreated Isaac. Later on, what he says to a 9-year-old Matt via Matt's flashback berating him for not knowing how to swim at the swim team's pool party and demands he tell no one as he would have got in trouble for letting teenagers drink alcohol.
- Outliving One's Offspring: His older son Camden was killed in combat overseas roughly one year before the events of Season 2.
- Retroactive Recognition: Try watching his treatment of Isaac after seeing John Wesley Shipp as Reasonable Authority Figure Henry Allen.
- Unwitting Instigator of Doom: His Kick the Dog moment of Matt when he was traumatized at age 9 instigated Matt's rage that allowed the teenager to become Master of the Kanima and go on his murder spree to kill the members of the team that were involved in the incident, including Lahey himself.
- We Hardly Knew Ye: Killed off by the Kanima in his second episode. Some would say, "Good riddance to bad rubbish."
Donovan Donati (portrayed by Ashton Moio)
A juvenile delinquent with anger management issues, Donovan faces jail time for repeated offenses. He blames the Sheriff for his fate and has threatened to kill him several times, when the Dread Doctors make him a part of their supernatural experiments.
- Alas, Poor Villain: Poor, psychotic Donovan. Between his father's tragic injury, his inability to follow in his father's footsteps, the Doctors getting their hands on him, and Theo manipulating him, he simply can't catch a break.
- Freudian Excuse: When Stilinski was still a deputy, his partner, Donovan's father, got his spine injured in a shootout while Stilinski was calling for backup. Donovan believes that if Stilinski had been there, his father would have been spared spending the rest of his life in a wheel chair.
- Hair-Trigger Temper: He can go from pleading innocent to screaming bloody murder at the drop of a hat. It's quite unsettling.
- Impaled with Extreme Prejudice: When he is chasing Stiles up a scaffold, Stiles tries to block his way by releasing construction material, accidentally impaling him with a bar in the process.
- Irrational Hatred: Donovan believes everything that goes wrong in his life is the Sheriff's fault. We later discover that his father, who was Stilinski's former partner, got severely injured in a shootout, and spend the rest of his life in a wheel chair. Since Stilinski was calling for backup at that time, Donovan blames him.
- Lobotomy: Is on the receiving end of one, courtesy of the Doctors.
- Never My Fault: That totally wasn't Donovan's gun, he carried it for someone else!
- Rage Against the Legal System: Ever since Donovan failed to qualify for police training due to his aggression problems, he doesn't like cops - especially not Sheriff Stilinski.
- Revenge by Proxy: Theo convinces him that going after Stiles would cause the most pain to the Sheriff.
- Sanity Slippage: Not that he was very sane to begin with, but after the Doctors are through with him, it only takes a little nudging from Theo for him to attack Stiles.
- Strapped to an Operating Table: After the Doctors pick him up in prison in "Condition Terminal," they do this to him. And then it gets worse.
- The Tooth Hurts: Falls victim to some very invasive dental surgery, when the Doctors remove several of his teeth to make room for new ones.
- Unwitting Pawn: For Theo, who uses his anger against the Sheriff to cause friction among the pack.
- Unwitting Test Subject: Probably didn't sign up for a guerilla lobotomy on the streets.
Mr. Stewart (portrayed by Salvator Xuereb)
Mr. Stewart is both Donovan's lawyer, and the father of Tracy Stewart. He's doing his best to help Tracy with her night terrors, and tries valiantly to keep Donovan from destroying his own life, but ultimately fails at both.
- Deadpan Snarker: In his interactions with Donovan, who is a somewhat problematic client.
- Good Parents: Tries hard to help his daughter, but ultimately proves ineffective - given that her problems aren't just night terrors - but also because she's been experimented on by the Dread Doctors and turned into a kanima.
- Heroic Bystander: Manages to stop a prison van going at high speed, when the driver seemingly suffers a heart attack, saving everyone inside. Of course, then the van gets attacked by Tracy, causing Donovan to run and get caught by the Doctors, the driver and guard to be mauled, and Stewart himself to get killed, making his heroic rescue somewhat pointless.
- Scream Discretion Shot: We don't see how Tracy kills him, instead, it cuts to a fleeing Donovan reacting in horror as he hears him scream.
At the Sheriff's Station
Deputy Jordan Parrish (portrayed by Ryan Kelley)
One of Sheriff Stilinski's newest and youngest deputies first appearing in Season 3.
Jordan Parrish came to Beacon Hills as if by intuition, quickly becoming the Sheriff's right-hand man. An ex-soldier, Parrish has a multitude of skills ranging from hand-to-hand, electronics and his specialty, explosives. Initially appearing to be human, he turns out to be supernatural in Season 4, which surprises him as much as anyone else; nonetheless, he takes his introduction to Beacon Hills' dangerous underside in stride, and establishes himself even further as a useful ally to the pack. Developing a close bond with Lydia, Parrish sets out to uncover his supernatural identity in Season 5.
In "Status Asthmaticus," she finds out that he's a Hellhound and part of The Wild Hunt.
- Adorkable: He tries to appear professional at all times, but occasionally his quirky personality gets the better of him.Parrish:[reading the deadpool list - he's on it] Well, that's kind of terrifying... What's the number?Lydia: That's how much you're worth.Parrish:[indignant] I'm worth five dollars?!Stiles: 5 Million!Parrish: I only make $40,000 a year! [thoughtful] Maybe I should kill myself.
- Alternate Identity Amnesia: In Season 5, he starts experiencing disturbing dreams and wakes up in strange places naked, covered in soot, and unable to recall how he got there. It turns out the dreams are part of his powers, and the soot is due to the activities his supernatural self is up to when Parrish is asleep.
To make matters worse, his supernatural side doesn't care much for Parrish's input and uses hallucinations of Lydia to keep him under control, leaving only mundane daily activities to be managed by Parrish. It takes the combined efforts of Lydia and the Argents to convince Cerberus to allow Parrish's human side to merge with him, as the internal conflict between the two minds is what was allowing the Beast to constantly win the battles between them.
- Ascended Extra: Deputy Parrish is introduced in season 3B as a Mauve Shirt, but becomes more important in Season 4 and is one of the main players in Season 5, being a major part of the plot.
- Back-to-Back Badasses: With the Sheriff against the Oni.
- Badass Normal: Able to hold his own against the Oni admirably. Subverted in Season 4, since he's actually supernatural. He still Fights Like a Normal, though. That is, unless his supernatural side is in charge, with comes both with fire powers and Super Strength.
- Beauty Is Never Tarnished: Used as a plot point. His hair and nails are fine after his assassin burned him alive, when even beings with a Healing Factor would have lost them.
- Because Destiny Says So: Played with. While there is indeed a prophecy about him facing off against the Beast, which he does fight numerous times throughout Season 5b, it is Scott that ultimately stops and kills the Beast, though technically nearly the entire pack was involved in defeating the monster and Parrish did grab hold of the Beast to allow Scott the killing strike.
- Big Damn Heroes:
- In "Perishable" he rescues Stiles & Lydia from a near-death experience.
- In "Lie Ability" he stops Lydia from killing herself and everyone at Eichen House - including her friends and her mother - through her out-of-control banshee scream, by hugging her. Similar to how she helps him focus and control his powers, he can temper hers. Though technically that was actually Cerberus, not Parrish since he had not yet merged with the possessive spirit to gain control of his hellhound form.
- Deadpan Snarker: He's almost as good as his boss in this regard.
- Demolitions Expert: His specialty from when he was in the military. It comes in very handy when dealing with one of the Nogitsune's nasty games.
- Demoted to Extra: In Season 6A, he largely stays out of focus.
- Subverted as in later episodes he becomes more important and was even crucial to Big Bad's plans.
- Die or Fly: His hitherto unknown powers manifested and saved him from being burnt alive.
- When he was in Afghanistan, turns out an explosive went off on him - and he walked away unscathed. Or did he?
- Dreaming of Things to Come: Ever since the onset of his powers he's had a recurring dream of carrying a corpse to the Nemeton and incinerating it - adding to the hundreds of bodies already covering the ground. When the Beast arrives in Season 5b, this dream threatens to become reality.
- The Engineer: He's able to build cellphone jammers. Might have a bit of Gadgeteer Genius thrown in, judging from the amount of electronic cables and devices littering his apartment.
- Elemental Powers: In "Condition Terminal" it becomes apparent that he can't just withstand fire, but also start it from within his own body. He is capable of covering his entire body in it and engulfing others in it.
- Establishing Character Moment: Amiably chats with school student Jared about good looks and healthy food, while examining what is presumably a bomb sitting in Jared's lap.
- Fair Cop: Considering he's portrayed by Ryan Kelley, who's a model◊, this trope applies.
- Fake Guest Star: In Season 5, he drives a large part of the plot.
- Fan Disservice: A hallucination that starts with him and Lydia making out turns into this, when his powers appear to severely burn her - which doesn't stop her from coming onto him, much to his discomfort.
- Friend on the Force: To Lydia & Stiles from Season 4 on; he seems to be their go-to guy whenever talking to the Sheriff might entail too much of a mess.
- In Season 6, Mason and Corey try to continue the tradition, but so far, Parrish is more resistant, clearly being fed up with getting drawn into supernatural shenanigans.
- Full-Frontal Assault: In "Perishable" to his would-be assassin, as his clothes had burned off.
- Healing Factor: Is rather difficult to kill, to the point where he not only seems immune to being burned alive, but also survives being almost gutted by an overly huge, superpowered werewolf.
- I Am Who?: Didn't know he was supernatural - until someone set him on fire and he survived completely unscathed.
- I Have Many Names: The Hellhound claims this, when Lydia and the Argents get to talk to him. He lists some of them, and they are all Names To Run Away From Very Fast.
- Implacable Man: The Hellhound is immune to mountain ash, kanima venom, and electrical shock attacks, and is nearly unstoppable - until Theo manages to stab him through the heart with a metal rod (and even that only seems to take him out temporarily). Averted with Parrish by his lonesome - he is immune to fire, everything else affects him like it would a normal supernatural (albeit one with healing powers).
- Intergenerational Friendship: With Chris Argent in Season 5.
- The Lancer: To Sheriff Stilinski, who tends to be a bit more prone to emotional outbursts.
- Magic Pants: Despite the Clothing Damage he suffers when his super-powered side is in charge and uses his Elemental Powers without stripping first, this is actually averted until the mid-season finale, "Status Asthmaticus".
- Mentor Ship: With Lydia, in Season 5: she's his mentor in all things involving his supernatural identity, he harbours a massive crush on her which is reciprocated, as of the mid-season finale.
- Mr. Fanservice: With the development of his powers - and his alterego's lack of understanding about concepts like "a civilized amount of clothing" - he ends up naked quite often: once in Season 4, and basically all the time in Season 5.
- Names To Run Away From Very Fast: When Lydia asks the Hellhound who she is talking to, he lists some of his names: Cerberus, Garmr and Black Shuck. The first two are Angry Guard Dogs for Hades and Hel, and the last one is a spectral hound from East Anglia, who mostly scares people to death, but occasionally also protects travelers.
- Nice Guy: Very much; his friendly nature is why he's great in a crisis (such as bomb removal).
- No-Sell: Kanima venom and electricity doesn't do anything to him and these things usually disable most supernatural beings. The Chimera found this out the hard way.
- Number Two: From Season 4 on, he is this to Sheriff Stilinski.
- Orange And Blue Morality: While Parrish himself ranges more along lawfully good tendencies, his Hellhound side has very clear priorities that don't always line up with those of the main characters, or necessarily those of his human self. Hellhound focuses on what he perceives to be his calling - guarding the town, keeping the secret of the supernatural safe from the public and protecting banshee Lydia - and has little time for concerns like replacing burnt uniforms or explaining stolen corpses. He also has no trouble getting rough with the heroes, should they stand in his way, though he usually treats them as allies.
- Cerberus usually avoids dealing with things unless circumstances forces him to, however, despite his disinterest in the heroes, he did warn them about a trap when he didn't need to, in fact they could have benefited Cerberus better by being served as bait for the Beast as the latter was waiting for them. Overall while neutral, he seems to have some sense of "morals" as despite his job being concealing the supernatural, he doesn't eliminate witnesses and when collecting the chimera's bodies when they were being guarded by deputies, he took them down non-lethally and with restraint, he also allowed Liam to say goodbye to Hayden when she died during her first round as a Chimera.
- Our Monsters Are Different: Parrish is a Hellhound. So far, he's generally appears human except for displaying fiery eyes, then fangs and claws when he uses his powers. Over the course of Season 5A, it's shown that he can set himself on fire, while remaining largely unharmed. When his supernatural side is in charge, he isn't deterred from what he sees as his mission, but doesn't attack people unless they actively get in his way.
- Playing with Fire: Seems to be a component of his powers; he survived being set aflame in Season 4 and when he's fatally slashed by a mutated werewolf in the Season 5 premiere, the wounds are smoking, and have healed just hours later.
- As revealed in "Condition Terminal", turns out he's can also start fire from within his own body.
- Pretty Boy: Ryan Kelley is impressively attractive; this gets a mention in dialogue:Jared: You're a cop? But you're so-Parrish: Handsome? Thank you. For a second there I thought you were gonna say I look really young.
- Servile Snarker: He is singularly unimpressed when people expect him to follow even the most ridiculous orders unquestioningly, and isn't at all shy to let them know. Even his boss isn't exempt from this:Sheriff Stilinski [At a crime scene]: [...] See if you can stall the ME for five minutes.
I have an expert of my own coming in to take a look.Parrish: You have an expert on teenage cannibals?
- Shell-Shocked Veteran: It turns out he was at the center of an explosion when he failed to defuse an IED in Afghanistan, but survived with nary a scratch.
No wonder he was so eager to believe in the supernatural.
- Sixth Ranger: He's joined Scott's pack as of Season 5.
- Supernatural Gold Eyes: They glow a fiery orange when he uses his powers (or gets really angry).
- Super Strength: As a Hellhound, he can flip Jeeps, and he's the only one who was able to stand half a chance fighting against the Beast in Season 5b, after Parrish and Cerberus merge, they get stronger and while it's brief, he actually starts to overpower the beast before being distracted by Lydia's scream.
- That Man Is Dead: The Hellhound claims that "Jordan Parrish died when I was born." It is unclear what he means by this precisely, since he also seems aware that Parrish has a personality of his own, which would indicate that he is indeed still alive.
- Undying Loyalty: To Lydia, especially in Season 5. It turns out to be part of their powers, which are complementary.
- And the sheriff. They occasionally butt heads, but he does genuinely like and respect Sheriff Stilinski, and when the sheriff is unlawfully removed from his office, it's clear he still views himself as Sheriff Stilinski's deputy first and foremost.
- Unresolved Sexual Tension: With Lydia, in Season 5.
The Dread Doctors serve as a memorable Moment Killer.
- Voice of the Legion: When the Hellhound speaks, he sounds like this.
- Walking Shirtless Scene: He spends most of Season 5 practically naked, due to his Hellhound side preferring being on fire to wearing clothes.
- The Wild Hunt: He's unknowingly part of it, due to being a Hellhound. This bites him in the ass as despite his incredible power, the Ghost Riders can easily enslave him as part of the Hunt
- Wreathed in Flames: Due to his powers, that happens a lot in Season 5. We see it for the first time in "Condition Terminal".
Deputy Tara Graeme (portrayed by Mieko Hillman)
A deputy in the Sheriff's station, Stilinski's right hand and close friend to the Stilinski family in Season 3A. Tara is commonly seen next to Stilinski as he's over whelmed with a murder investigation.
- Because You Were Nice to Me: Stiles is affected by her death because she used to help him with his homework when he had to wait at the station for his dad to finish when he was younger.
- Character Death: Tara was sacrificed by the Darach as a Philosopher, because she used to be a middle-school teacher.
- Fair Cop: Was kind and helpful to Stiles, competent cop and always seen by the Sheriff's side during the Darach's killing spree, and quite pretty too.
- Foreseeing My Death: Played with in an interesting way, when she investigates a 911 call at the school where she sees her own corpse, she's killed right there and then her real corpse is laid out just like before in the hallucination.
- Mauve Shirt: Her role in Season 3A.
- Number Two: Was this to Sheriff Stilinski before her death and being replaced by Parrish.
- Slashed Throat: How she goes out, courtesy of the Darach.
Deputy Haigh (portrayed by Lou Ferrigno Jr.)
A deputy in the Beacon Hills Sheriff department and occasional partner to Parrish. Haigh takes a decidedly unlawful turn when coming across the Benefactor's hit list - the Dead Pool.
- Alone with the Psycho: Is the psycho in question: he cheerfully splashes gasoline on Parrish in his patrol car and then sets him on fire, while Parrish desperately attempts to talk him out of it.
- Dirty Cop: A variation. We don't know if he can be bribed, but seeing Parrish's name on a hit list with a very high prize tag is enough to make him turn criminal.
- False Friend: Tries to murder his colleague Parrish for money.
- Good Cop/Bad Cop: He and Parrish fall into this when apprehending the de-aged Derek. Subverted in that it doesn't seem so much planned as natural inclination for both of them.
- Jerkass: Is introduced making fun of Parrish and tazering teenage Derek. And it only goes downhill from there.
- Killer Cop: He tries to be one, after getting his hands on the Benefactor's hit list. Fortunately, he's not very good at it.
- Kill It with Fire: How he tries to kill Parrish. It doesn't work.
- No-Holds-Barred Beatdown: Is on the receiving end of one from a very naked and soot-covered, but otherwise unharmed Parrish.
- Pay Evil unto Evil: Braeden needs to find out who his accomplices are, and starts the interrogation by breaking his nose.
- Police Brutality: He's very quick to wield a tazer to subdue teenage Derek, despite Parrish's protests.
- Sensitive Guy and Manly Man: He and Parrish are initially set up as this: while Parrish approaches de-aged Derek reasonably and tries to figure out his problems in order to help him, Haigh is loud, authoritative, and quickly resorts to violence.
Deputy Valerie Clark (portrayed by Benita Robledo)
Deputy Valerie Clark is another of the Sheriff's younger officers, who debuts in Season 5. She's very tough, despite her small frame, and displays a no-nonsense attitude. She's the older sister of Hayden Romero, and seems to act as her guardian.
- Action Girl: She has no problem roughing up delinquents much taller and heavier than her.
- Braids of Action: Wears her hair in a long braid down the back.
- Badass Adorable: Manages to intimidate the struggling Donovan, despite barely reaching his shoulder.
- Cool Big Sis: To Hayden. She reminds her that kids should be embarrassed to be seen with their parents, not their siblings, reproaching her gently for almost leaving her medication in the laundry with her next sentence, and then teasing Hayden about Liam.
- Determinator: After Donovan seemingly escapes from his cell, she swears that she won't leave Sheriff Stilinski's side until he is caught.
- Fair Cop: Like her little sister, she's very pretty and cute.
- Locked Out of the Loop: Despite her having seen more than her fair share of strange occurrences, Valerie is kept unaware of Hayden's conversion into a Chimera, and then later when she becomes a true werewolf and the truth of the supernatural in general, for the time being.
- Promoted to Parent: Seems to be the guardian for her younger sister, Hayden.
Deputy Strauss (portrayed by Aaron Thornton)
Another young deputy introduced in Season 5.
- Fair Cop: He is a very handsome police officer, who pretty much looks like he's fresh from the academy.
- Locked Out of the Loop: He's witnessed a lot of the weirdness such as Parrish breaking out of a cell by bending iron bars, and Clark writing a report about her encounter with a really huge monstrous animal, but hasn't been officially introduced to Beacon Hills' more magical side - yet.
- Spear Carrier: He's around when Clark needs someone to talk to, or both Clark and Parrish are busy dealing with monster issues.
At Eichen House
Brunski (portrayed by Aaron Hendry)
An orderly at Eichen House who loves his job, mostly because it allows him to tazer, restrain, and sedate people. As it turns out, he's also a serial killer, and is working with the Benefactor.
- Alone with the Psycho: Gets nervous when Stiles and Lydia show up in "Perishable", since he thinks they are onto him, leading to the trope.
- Ax-Crazy: He really enjoys forcibly restraining people far too much. Not to mention murdering them.
- Blood from the Mouth: After Parrish shoots him.
- The Bully: He especially enjoys pushing weaker people around, which seems one of the reasons he became an orderly in an asylum. Apparently used to be this even back at school, where he tormented Bobby Finstock. In "Insatiable", Coach manages to finally take revenge.
- The Dragon: He does all the legwork for The Benefactor.
- Killed Mid-Sentence: When Parrish tells him to drop the syringe he wants to inject into Lydia's neck, he decides to take a chance, and rather condescendingly tells Parrish that he seems so young, he probably never even fired his weap— and then Parrish shoots him.
- Jerkass: Brunski is a genuinely unpleasant person, who enjoys putting people down mentally and physically.
- Mercy Kill: In his delusion, he believes he's not murdering people, but "releasing" them.
- Orderlies Are Creeps: Turned Up to Eleven when he confronts Stiles and Lydia in "Perishable".
- Sadist: Makes Lydia listen to her grandmother's last breaths. Which he taped. While he murdered her.
- Smug Snake: He loves lording his power over people he dislikes - which seems to be everyone, but especially Stiles.
Meredith Walker (portayed by Maya Eshet)
Another banshee first seen in "Echo House." Her powers and Lorraine Martin's unfortunate experiments have turned her mentally unstable, forcing her to live in Eichen House. She has no living family. In Season 4, she returns to help Lydia and the others decipher parts of the Deadpool, the hitlist on supernatural creatures put out by the mysterious Benefactor. Exhausted, she seems to be Driven to Suicide - only to turn out to be the Benefactor herself. Her broken mind caused her to believe the insane rantings of a comatose Peter Hale, who was fantasizing about killing all "weak supernaturals," and decide to fulfill his plan by setting up the Deadpool. In Season 5, Meredith telepathically communicates with Lydia during her stay in Eichen House, and teaches her how to use her banshee scream as a weapon. She also warns her that if she doesn't escape and help her friends, "everyone" is going to die.
- Ascended Extra: She appears in two Season 3 episodes and comes back as a recurring character throughout Season 4&5. She is also the Benefactor.
- Astral Projection: In S5, she shows up in a mindspace she's able to share with catatonic Lydia.
- The Atoner: Meredith clearly regrets releasing the Deadpool and the injuries she caused when her powers first manifested. In S5, she teaches Lydia how to use her scream as weapon, and warns her of the deaths to come in part to make up for her previous actions. She also plays a key role in getting Lydia out of Eichen.
- Beware the Silly Ones: Meredith is very odd, but she's not to be underestimated. Especially when it comes to setting people up to be murdered.
- Broken Bird: From the start, she was a shy and fragile person, and hearing the dead probably didn't help much. Then Lorraine tried to help her access her powers, putting her into a coma. And then she met Peter.
- Cloud Cuckoolander: Her more, let's say, eccentric habits drive Lydia up the wall.
- Dark and Troubled Past: The first time she used her banshee scream, she was at school - windows shattered and people ended up hurt or even dead.
Her whole family is also dead.
- Disc-One Final Boss: She is the Benefactor, and thus the seeming Big Bad of Season 4, but gets defeated two episodes before the finale, making way to the BiggerBads Peter Hale and Kate Argent.
- Driven to Suicide: Subverted: She appears to take her own life after a conversation with Lydia and Stiles, but it later turns out she faked her death with the help of Brunski.
- Mad Oracle: Her hints are often so enigmatic as to be totally useless.
- Medicate the Medium: In 3B, Meredith is introduced as a patient at Eichen House asylum, institutionalized because she hears voices and won't stop screaming. Turns out she's a banshee, like Lydia.
- A Mind Is a Terrible Thing to Read: Meredith had to spend several months psychically connected to Peter Hale as he was going insane. Given how her mindset changed after that, it borders on (albeit accidental) Mind Rape.
- My God, What Have I Done?: After snapping out of her obsession with fulfilling Peter's plans, she's genuinely horrified by the consequences of releasing the Deadpool.
- The Ophelia: It's safe to say that Lorraine Martin inadvertently drove her insane. Lydia feels really bad about it.
- Social Darwinist: See Well-Intentioned Extremist below.
- Walking Spoiler: In Season 4.
- Well-Intentioned Extremist: She is this to a scary degree, believing that all "weak" supernaturals need to be wiped out to let Peter Hale remake the supernatural world in his image. Fortunately, she begins to grasp the true consequences of an idea like that through her interactions with Lydia.
Dr. Conrad Fenris (portrayed by John Posey)
A Doctor at Eichen House, who seems to be in charge of the supernatural ward.
- Cassandra Truth: Warns people that Valack is extremely dangerous, and is ignored at their peril.
- Screw This, I'm Outta Here!: When the Doctors arrive, he prefers running and hiding to sticking with Scott and an unconscious Kira.
- What Happened to the Mouse?: After Valack breaks out of his cell, he apparently takes on Fenris' appearance, to be able to continue his work against the Doctors. We don't discover what happens to the real Fenris, but given how little care Valack shows for the lives of other people, he probably isn't doing so well.
Dr. Gabriel Valack (portrayed by Steven Brand)
An inmate locked away in Eichen House's super secret Level 6 prison for supernaturals, Valack is sought out by Deaton for information. He has a third eye on his pineal gland. Valack is often helpful, but has a tendency to turn people who talk to him into living vegetables.
- Batman Gambit: When the pack comes to him for answers about the Dread Doctors, he gives them information, but asks for a recording of Lydia's banshee scream in return.
The Doctors arrive in the wake of the teenagers, who accidentally provided them with a passage, and cut Valack's third eye out, leaving him wounded but alive.
He then uses the recording to crack the glass walls of his cell and apparently proceeds to take over the hospital, pretending to be Dr. Fenris.
- Boom, Headshot!: A variety: Lydia's banshee voice blows half of his head off.
- Cassandra Truth: Claims that he tried to warn people when the Doctors came to Beacon Hills the first time, but nobody believed him.
- The Dreaded: Deaton is strongly advised against seeing Valack by Dr. Fenris, because the last person who did so "left the room, but not the building."
Later, he telepathically "shows" Peter what he is, leaving Peter screaming in panic.
- Evil Brit: Has a very posh British accent, as befits a possibly villainous psychic.
- Eye Scream: The Doctors rip out his third eye.
- Faux Affably Evil: Dr. Valack is polite and soft-spoken, but seems to enjoy the negative effect his powers have on other people.
- Gorn: Half his head is blown away by Lydia's scream.
- Hoist by His Own Petard: He enhanced Lydia's abilities to foil the plan of the Doctors, causing her to come periliously close to not only dying herself but killing everyone else with her scream. She's stopped before this happens, but not before she makes Valack's head explode.
- Homage: A polite, yet unsettling high security prisoner with an accent and a potentially dark past, whom a main character seeks out for help, having been warned that the man they'll visit will try to get into their head: Dr. Valack is evidently inspired by Hannibal Lecter. His introductory scene is even written and filmed as a recreation of Anthony Hopkins' iconic first appearance as Lecter in The Silence Of The Lambs. In addition, his relationship with Lydia in Season 5 shares certain elements with Lecter's mentorship of Clarice Starling.
- I Should Write a Book About This: Has written a cheesy scifi-horror novel about the first time the Dread Doctors came to Beacon Hills, to give people the means to fight them, should they return.
- Laser-Guided Karma: In "The Last Chimera," Valack tells Schrader that Lydia could shatter his skull if someone taught her how. Then he uses trepanation to put a hole into Lydia's head, to heighten her abilities - he hopes this will enable her to find the Doctors' latest creation, the resurrected Beast, but also knows that doing so will kill her. And then Lydia's powers get out of control before he can get her to concentrate on the Beast, causing her to scream in Valack's presence, and blowing off half of his head.
- Lobotomy: The good doctor is entirely too fond of trepanation as therapy, and doesn't necessarily ask his patients' permission first as Lydia has to discover.
- Mad Scientist: In "Amplification," it's said Valack used to be the chief medical officer of Eichen House - and conducted experiments on supernatural patients, apparently to increase their abilities. It didn't end well for them.
- Master of Disguise: Appears to Lydia as Aiden in the Season 5 opener, and pretends to be Fenris to get Natalie Martin's signature to put Lydia into Eichen House to "keep her safe."
- Meaningful Name: According to Word of God, Valack is named after Valac, a demon lord mentioned in the Lesser Key Of Solomon. When summoned, he is able to show hidden treasures and warn the sorcerer of snakes. In contrast, his first name recalls the archangel Gabriel of Abrahamic religions: messenger angel, psychopomp, and occasional trumpeter.
- A Mind Is a Terrible Thing to Read: He seems able to put at least non-supernatural beings into a coma by opening his mind to them.
- Morally Ambiguous Doctorate: He has quite a pleasant bedside manner, but his ideas about patient consent, sanitary conditions, and overall safety of his medical equipment are *very* lenient. You also don't necessarily want to be the one assisting him - like Nurse Cross, you might end up part of the experiment yourself.
- The Omniscient: Valack's powers allow him to know a lot more than a man locked up in a cell and kept from outside contact usually could.
- Pineal Weirdness: The pineal gland is traditionally believed to be the seat of the third eye. Valack's third eye is positioned exactly where his pineal gland would be.
- Psychic Powers: He seems to be clairvoyant, knowing things like Kate's plans without leaving his cell. Since he guessed what Deaton wanted to know before Deaton could say it, he also seems to be a mind reader. Finally, he is able to convey knowledge to others by showing it to them mentally.
- Third Eye: He has one in place of his pineal gland. He drilled a hole into his forehead so people can look into it. It gets ripped out by the Dread Doctors in "A Novel Approach."
Schrader (portrayed by Clayton Froning)
Schrader is another orderly at Eichen House, who also works at the front desk. In the flashforward of the fifth season premiere, he falls victim to Lydia's banshee Scream after assaulting her with a syringe.
- Asshole Victim: Lydia's scream catapults him across her cell, just as he tries to assault her with a syringe.
- Dirty Coward: Hides under the desk when the Dread Doctors arrive, causing them to ignore him.
- Orderlies Are Creeps: He's a particularly disgusting one, pretending to be friendly until he's alone with patients, and then attacking them with syringes.
- Playing with Syringes: Pretends to miss veins to be able to prick patients with the needle repeatedly.
- Soft-Spoken Sadist: Whispers gently and calmly as he repeatedly pushes the syringe into Lydia's flesh.
Nurse Cross (portrayed by Mandy Levin)
Together with Schrader, Nurse Cross seems responsible for Lydia's wellbeing in Eichen House. She's convinced that Lydia is only pretending to be catatonic,
and constantly berates her for playing the victim.
- Asshole Victim: Valack tries out one of his medical contraptions on her,
causing her to shake and scream, before collapsing onto the floor, killing her.
- Battleaxe Nurse: True to her name, Nurse Cross really isn't all that caring and doesn't seem very well-meaning.
- Evil Redhead: She has red hair and is borderline abusive to Lydia, though not as downright evil as Schrader.