Complete Monster: Season 3: Dr. Isaac Taft proves Humans Are the Real Monsters in a show full of vicious Fae. Desiring to become a powerful Fae himself, Taft has multiple Fae kidnapped and subjected to hideous and torturous experiments before dumping their corpses into a mass grave. One of the few survivors is left mentally scarred and nearly insane. Taft captures the succubus heroine Bo's ex-boyfriend Dyson and has him experimented on as well, planning to blackmail Bo's current lover Lauren into experimenting on Dyson to transport his essence into Taft. Interested only in his own advancement, Taft believed that with billions of dollars, he could do anything he desired.
Crack Pairing: Vex/Kenzi actually has a fair few supporters.
The Norn arguably. Her deal seems to be: you sacrifice that which you value the most in exchange for what it is you want. If that is the case (which Dyson apparently knew), then it's his fault for not knowing what it was that he valued the most. Her behavior after is her merely sticking to the deal, and refusing to go back. If someone had offered her something in exchange for Dyson's love, that would be different.
They tried, and she refused. She took great pleasure in everyone's frustration and misery, and was uncaring at best about the possibility of the Fae being wiped out. Maybe not a villain, but definitely an unrepentant Jerkass.
Hale's rejection of Kenzi in "Fae'd to Black" is portrayed as a Kick the Dog moment. But he had no reason to think anything was actually wrong with her (nor did anyone else), and last time she barged in him during a meeting (ignoring his attempts to tell her to stop) to talk about fashion. It's hardly surprising that he shut her out at the end.
Dyson/Kenzi is popular as well, having been subtly hinted at from season 1 and heavily teased in season 4 despite Kenzi's official relationship with Hale as of 4x06.
Genius Bonus: At first glance Tamsin being a Dark Fae seems out of step with traditional Norse mythology. Valkyries are usually thought of as the (rough) Norse equivalent to Judeo-Christian angels. But actually, their depiction in Norse mythology was not always so positive. Many of the older myths describe them as violent war spirits. And they didn't just carry off the souls of the valiant dead, they helped make them dead.
Hilarious in Hindsight: In the season two episode, "Mirror, Mirror", Bo mispronounces Baba Yaga's name as "Baby Yoda". "Baby Yoda" would exist years later with the Disney+ debut of The Mandalorian in 2019.
Bo/Lauren=Doccubus. So called because Lauren is a doctor and Bo is a succubus.
And Valkubus is Valkyrie (Tamsin) and Succubus (Bo).
LGBT Fanbase: Developed a strong one due to the positive portrayal of the bisexual heroine, and the respective way it handled Bo and Lauren's relationship.
Moral Event Horizon: If Jack/Hades raping Tamsin while impersonating Bo didn't put him over, murdering Trick and Aife in the next episode did.
Narm: The show's cheap special effects and low-budget cinematography occasionally conspire to suck the otherwise-excellent drama out. It's especially bad when two characters are in what is ostensibly a mortal fight to the death, yet it consists of them standing stock-still and mugging at each other while little digital sparks fly from their raised hands.
OT3: Unsuprising, given the love triangle, or now, love (sort of) rhombus.
Bo/Dyson/Lauren
Bo/Lauren/Tamsin
Bo/Dyson/Kenzi
Vex/Kenzi/Dyson
The Scrappy: It didn't matter whether a fan shipped Bo/Lauren, Bo/Dyson, or Bo/Tamsin- they weren't signing on for Bo/Rainer.
Squick: "Let the Dark Times Roll". When Bo asks to see the paperwork that claims she's now Dark, the Dark Fae records keeper tears off his scalp and gives it to her. She is appropriately grossed out.
In "End of a Line", the only way to take control of or know who commands Revenants is to drink their blood. Eventually, Bo herself is forced to do this.
Strangled by the Red String: Rainer is introduced to the audience towards the end of season 4 with Bo declaring he is her destiny and thus also the final resolution of her multi-season ongoing love triangle with Dyson and Lauren. Strangely, almost no one decided they were on board with this ship.
The Woobie: Bo has accidentally killed a lot of people, a lot of whom were her lovers, Lauren has been manipulated into being a slave to people who hate humans twice and stayed with her coma-girlfriend for five years only for her to die violently before her eyes straight after she woke up, and her treatment took a turn for the worse under Lachlan, and Kenzi's stepfather was apparently so bad that she was nearly willing to risk her worst fear ( Baba Yaga) to try and rid herself of him and she ended up on the streets from a young age. Honestly, though, no one in the gang's life seems to have been a bed of roses.
Iron Woobie: Since they all keep going. Bo says Lauren is the strongest person she's ever met. Dyson, meanwhile, calls Kenzie the strongest person.
