The line between "hero" and "villain" has always felt much thinner in the A Song of Ice and Fire universe than other big fantasy franchises.
For example, Jaime Lannister (Nikolaj Coster-Waldau) practically plays hopscotch with that line in every episode of Game of Thrones, constantly giving viewers new reasons to root both for and against him. As such, the series often pits two characters audiences are meant to sympathize with against each other, like when Jaime charges Daenerys (Emilia Clarke) during the Loot Train Battle in season 7.
In contrast, Game of Thrones also often features villains going up against other villains. In a show known for constant scheming, backstabbing, and broken alliances, the least morally sound characters regularly turn on each other. These five Game of Thrones villains end up dying at the hands of other villains who are nearly as bad, or in some cases, even worse.
Craster
Craster (Robert Pugh) is arguably the most despicable character throughout all of Game of Thrones. The willding, who shares a strained alliance with Lord Commander Jeor Mormont (James Cosmo) and the Night's Watch, is known for sexually assaulting his daughters and sacrificing his infant sons to the White Walkers. In exchange for allowing this disgusting behavior continue, Craster allows the Night's Watch rangers to rest in his keep beyond the Wall during their expeditions.
After intentionally starving his guests from the Night's Watch, the brothers in black stage a mutiny against Mormont, killing both their leader and Craster. However, the Night's Watch mutineers later prove to be a thorn in Jon Snow's (Kit Harington) side, and continue to torture Craster's surviving children. Jon and his allies finally put the threat of the mutineers to rest after acting Lord Commander Alliser Thorne (Owen Teale) sends him on what is intended to be a suicide mission, but Jon's team not only survives their clash against the mutineers, but defeats them once and for all.
Lysa Arryn
When audiences first meet Lysa Arryn (Kate Dickie), it quickly becomes apparent why everyone prefers her older sister Catelyn (Michelle Fairley). Lysa allows her young son Robin (Lino Facioli) to call the shots in the Vale, giving into the boy's most sadistic instincts, which usually involve tossing anyone and everyone out the Eyrie's "Moon Door," and still breast feeds him at far too old an age.
Additionally, viewers later learn that Lysa, at the instruction of Littlefinger (Aidan Gillen), poisoned her husband, Jon Arryn (John Standing), which essentially kickstarts the plot of the entire series.
After marrying Littlefinger, Lysa witnesses him kiss Sansa Stark (Sophie Turner). Mistaking this unwanted advancement for intentional seduction, Lysa screams at and threatens her niece, before Littlefinger intervenes, calming his wife and reassuring her that he's only ever loved one woman.
Once Lysa's guard is down, Littlefinger adds "your sister," and shoves her out the Moon Door. Although Lysa can no longer intimidate Sansa, she may have been replaced by an even more sinister figure.
Roose Bolton
Roose Bolton (Michael McElhatton) earned his rightful place on several fan least-favorites lists after his betrayal of Robb Stark (Richard Madden), killing the beloved king himself at the infamous Red Wedding. Roose's collaboration with Tywin Lannister (Charles Dance) and Walder Frey (David Bradley) allowed him to take over as Warden of the North after Robb's death.
However, Roose is not even the worst Bolton on the show. His bastard son Ramsay (Iwan Rheon) is depicted as purely sadistic and cruel, turning Theon (Alfie Allen) into "Reek" through torture, hunting women with his vicious hounds, and relishing every one of his kills.
Roose learns how horrible Ramsay truly is first hand after Ramsay stabs his own father through the chest upon learning that his wife Walda (Elizabeth Webster) has given birth to a boy who could threaten Ramsay's position as heir. He then dispatches both Walda and his newborn brother, becoming Warden of the North in Roose's stead.
Balon Greyjoy
Balon Greyjoy (Patrick Malahide), Theon's abusive father, declares himself the fifth king in the War of the Five Kings. The second Balon and Theon reunite, he reduces his proud son into a sniveling, servile man. His overbearing influence and toxic masculinity drive Theon to betray his Stark family and take Winterfell in his father's name.
Balon is then killed by his younger brother, Euron (Pilou Asbæk), allowing him to win the ensuing Kingsmoot and rule the Iron Islands. Euron becomes an even crueler ruler than his older brother, forging alliances with Cersei Lannister (Lena Headey) and even killing Daenerys Targaryen’s dragon Rhaegal. While Euron is depicted as a much worse threat in the books, his show counterpart is still a more menacing foe than Balon.
Qyburn
If the perverted, incompetent, and scheming Pycelle (Julian Glover) can successfully become a Maester, imagine how awful someone has to be for the Citadel to kick them out. Qyburn (Anton Lesser), the creepy former Maester known for his necromancy experiments, became one of Cersei's few allies in King's Landing. He would eventually go on to serve as her Hand of the Queen, and helps her pull off her plan to destroy the Great Sept of Baelor and everyone in it.
Ultimately, Qyburn is hoisted by his own petard, dying at the hands of Ser Gregor Clegane (Hafþór JúlÃus Björnsson), aka "the Mountain," a man Qyburn brought back from the dead himself. During Daenerys' assault on King's Landing, the Mountain sees his brother, Sandor Clegane (Rory McCann), better known as "the Hound," and loses all focus. When Qyburn tries to reign Gregor back in, the Mountain wordlessly crushes in his head.
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