Despite having no Sith Powers, Grand Moff Wilhuff Tarkin is just as horrible. In the only movienote except for a quick scene in Revenge of the Sith in which he appears, he orders the destruction of a heavily populated and influential planet purely to make a point to Leia, blowing up Alderaan even after Leia tells him what he wants to know; he seems quite willing to repeat the process ad infinitum if such is necessary to quash the Rebellion. The only emotion he shows at all at this prospect is a kind of cold satisfaction. The Star Wars Expanded Universe only makes him worse: He first came to the Emperor's attention after he crushed a peaceful tax protest under his boots...by landing his Star Destroyer on them, killing thousands. He codified the Empire's policy of rule through fear as "The Tarkin Doctrine," which led to the creation of the Death Star (a project he oversaw); he later tested the Death Star's superlaser on the prison planet Despayre, the final site of the Death Star's construction. Thus, despite not having anywhere near the power of Palpatine, Wilhuff Tarkin is directly responsible for the destruction of two planets and the deaths of billions.
Pong Krell from season 4, when introduced, seemed to be the standard General Ripper, Just Following Orders no matter what the casualties. This is unexpected from a Jedi, but there have been some like that in the past (like how the Jedi Exile and other Jedi were in Mandalorian Wars, or in the last Sith War a thousand years prior) and thus seems like a case of Good Is Not Nice. Then he orders the death of Jesse and Fives, as well as a court martial for disobeying orders after they saved the day by doing so. Then he truly crosses the Moral Event Horizon-he plays two armies of Clone Troopers against each other by saying that there were infiltrators, having them kill each other. And shortly after that, he confesses that he's been trying to lose as many clones as possible because his plan was to sabotage the Republic war effort from within in order to ingratiate himself to Count Dooku and become the Sith Lord's next apprentice.
Keeper Agruss the Zygerrian from season 4 is a slaver, which is bad in itself, but goes above and beyond the call of duty on that. In particular, he has no problem casually murdering dozens of slaves if it means breaking a Jedi, tortures and kills other slaves for Obi-Wan's defiance, not only making his help unproductive but actually alienating those he seeks to protect. He truly earns his credentials at the end: When The Republic has arrived and it's quite clear he's lost. he sets the system to dump the slaves into the abyss, smashes the panel to prevent Obi-Wan from saving them (Ahsoka manages to get them to safety), then gloats about how Obi-Wan can't retaliate because he's a Jedi.
A minor Star Wars character who only physically appears in one comic of the "Dark Times" series (which depict the aftermath of Episode 3, when Palpatine has all but total power in the galaxy) manages in his brief screentime to become a "shining" example of the trope as well: Dezono Qua. He even has a Meaningful Name tipping off readers knowledgeable in Native-American myths about his nature. Qua is a minor human noble who dabbles in slavery, and is the purchaser of one hero's young daughter. When he's confronted, Qua reveals the reason he deals exclusively in child slaves: he eats them. When asked why he has children purchased solely to kill and cook them, Qua responds Because I could..
Most Gen'Dai are pacifistic recluses who never leave their homeworld. Alas, this was not the case with Durge, bounty hunter, assassin, and Separatist commander during the Clone Wars. One of the most prolific-and sadistic-Jedi hunters of the war, Durge made his first appearance on one of Naboo's moons, where he and Asajj Ventress massacred the the local Gungans in a test of their new chemical weapon—a weapon they were planning to use against the planet Naboo next. When a squad of Jedi and clone troopers arrived to investigate, Durge tried to kill them all, even going so far as to try and skin Padawan Zule Xiss alive. Later, during the battle of Queyta, Durge would open fire on his own men, using the explosions caused by their deaths to kill a pair of Jedi Masters, one of whom he finished off by submerging in lava. Obsessed with having the title of greatest bounty hunter ever, Durge made an attempt on the life of Jango Fett's son, Boba, and would go out of his way to kill Jango's clones, all in the name of cementing his reputation. Finally slain after slaughtering the entire crew of a captured ship, Durge was as vile as even a bounty hunter could get.
Jango Fett: Open Seasons: Jango's Arch-Enemy, Tor Vizsla, is the founder of the Death Watch extremists bent on returning the Mandalorians to their worst warmongering ways and is responsible for every tragedy in Jango's life. When Jango was a young boy, his entire family was killed by Vizsla and his men when they got caught in the crossfire of his war with Jaster Mereel and the True Mandalorian faction. Later on, when Fett had succeeded Mereel as leader of the True Mandalorians, Vizsla conspired to trick the Jedi into believing that the True Mandalorians were slaughtering political dissidents (the "dissidents" were actually armed insurgents) along with women and children; evidence for the latter was provided by Vizsla's men. This resulted in a horrific battle between the Mandalorians and a task force of Jedi that left almost everyone on both sides dead.
Star Wars: Knight Errant: Lord Odion, born as the heir of the mighty Sith Calimondra family, had an unusual affliction where the existence of others caused him physical anguish. Finding a Sith solution, Odion found joy in the murder of others to the point where the murder of sentient beings became a high to him. Having learned to twist the minds of others, Odion found joy in forcing helpless captives to attack carnivorous monsters and restored their minds to savor their agony when they were devoured. Leading countless campaigns that claimed the lives of innocents in his battle with his hated younger brother Daiman, Odion found a solution to the problem of existence: an ancient Sith helmet. An artifact that would initiate homicidal and suicidal insanity in living things. To power it up for its task, Odion had imprisoned every child in his realm to deprive them of hope and used their terror and anguish to power his helm, being but moments away from ending all life before being stopped. Odion's final goal was to exterminate all life and rule the graveyard he'd made of the Galaxy.
Chantique the slaver is a leader of the slaving operation Crucible and as the Magister Impressor is responsible for educating and teaching new slaves. Chantique proudly presides over a legacy of misery and torment, forcing slaves to battle one another in pointless gladiator fights, with one slave in particular having to carry the memories of every other slave who had ever suffered in the past. After the slave's suicide, Chantique proceeded to mock his would-be savior on the meaninglessness of his death. A brutal sadist who was not above outright murdering her vicitms, Chantique also possessed a grudge against her old rival Jarael and stopped at nothing to make her suffer and destroy all the relationships she had formed. The crowning moment of cruelty for Chantique was seeing that ever since she rose to lead Crucible, she celebrated by having one of her old schoolmates buried alive. When she learned her father was coming to collect her old classmates, Chantique buried them all and gleefully mocked him that he should have taught them how to hold their breath.
Demagol, born Antos Wyrick, became one of the most feared and loathed beings in Mandalorian history. Known as "The Flesh Carver," Demagol hungered to learn the secrets behind the Force by torturing the Jedi who fell into his grasp, even the children when children are honored and protected by Mandalorians. The experiments would often end in excruciating vivisection. Revealed to have once sold his own daughter into slavery at Crucible, when faced by her after stabbing her in the back, Demagol snarled he only wanted "The good ones. The ones that worked!." Combining a complete Lack of Empathy with sadisticscientific curiosity, Demagol stands as a unique monster in the Star Wars franchise and centuries after his death, his name had become a curse to the Mandalorians.
Haazen began his career in evil as a failed, jealous Padawan who murdered his former best friend Barristan Draay during the Great Sith War. His body rebuilt and scarred, Haazen's soul became as twisted as his outward appearance. Ruthlessly manipulating other Jedi into murdering their own Padawans, Haazen had Coruscant bombed from orbit to initiate a war that would allow him to destroy and rebuild the Sith and Jedi orders while ruling them from within. Haazen kept the true leader of the Convenant and the only one who might have stopped him in a state of horrible suspended animation where she could perceive every atrocity he manipulated her son in to committing, including the deaths of children. A man defined by jealousy and hatred, Haazen's grand goals of plunging the galaxy and causing the deaths of countless innocents while perverting the Jedi Order towards darkness were nothing more than an attempt to feed his ego and spit on the grave of Barristan Draay.
The Emperor of the One Sith, Darth Krayt was a great Jedi Knight once, but that time is long past. Seizing control of the Imperial throne, Krayt establishes a military dictatorship that violently destroys any who might be a threat. When a single Mon Calimari shipman is captured on board a rebel cruiser, Krayt flips out and kills him after ordering a summary execution of ten percent of the Mon Calimari species while the rest will be forced into camps and exterminated later. Suffering a betrayal from his most trusted follower, Krayt later returns from the death, now of the belief the galaxy must experience death as he had before launching a violent, galaxy wide campaign, with the plan to manipulate his enemies to use a toxin against Coruscant, the most populated planet in the galaxy, that will kill everything on the world except the Sith.
Vul Isen is a Mad Scientist whose job is genocide. When Darth Krayt decides the Mon Calamari species needs to die, Isen is appointed as the one to expedite the process. Isen's first plan is to create a sea monster known as a Leviathan that steals the souls of its victims and imprisons them in eternal anguish. When this is destroyed, Isen develops a toxin to kill all life on the planet. Despite the best efforts of the galaxy, Isen exterminates 80 percent of life on Mon Calamari with nothing more than satisfaction at his own brilliance. He then proceeds to attempt to exterminate all life on another planet that defies the Sith after having refugees hunted down
Beginning his career as an arrogant, brash Jedi Apprentice who considered aliens to be inferior to humans, Exar Kun found himself drawn to the Dark Side. Under the tutelage of the ghost of dead Sith Lord Freedon Nadd, Kun plunged down a dark road where he embraced the darkness and destroyed his master's spirit, claiming lordship of the Sith. As the Dark Lord, Kun would enact alchemical experiments upon his followers, a species called the Massassi, twisting their bodies into weapons of war for his use. Kun would corrupt other Jedi apprentices by having them possessed by Sith Ghosts and sent them to murder their own masters. In the Sith War, Kun marched into the very heart of the Republic, murdered the Supreme Chancellor and delivered a grand speech to the Republic before killing his own Jedi Master in a duel. Kun would then trick several followers into initiating a supernova that would devastate entire star systems, including a genuinely loyal servant, mostly because the man's undying devotion irritated him. When cornered at his home base, Kun sucked the life from the entire Massassi race to preserve his own existence and trapped himself within his temple for four thousand years. When his spirit returned to haunt Luke Skywalker's students, he proved himself as cruel as ever by manipulating Luke's prized students, burning one alive from the inside out and having another use a superweapon to destroy solar systems.
Aleema Keto may not be a Sith Lord herself, but she is no less evil and cruel than many of them. A Spoiled Brat questing for adventure, she and her cousin Satal, heirs of the Keto dynasty, discovered the spirit of Sith Lord Freedon Nadd who taught them Sith Magic. They immediately used it to subjugate their home system, overthrowing and encasing their parents in carbonite. Aleema sewed her tutor's mouth shut after giving an illusion of his tongue turning into an eel and later blasted the flesh off his bones in a rage after he he spilled her wine. Aleema later conducted the executions for their regime by feeding victims to torture droids while she and Satal launched a crusade that took many lives, terming their faction the Krath after a demon in their childhood stories. Aleema was especially fond of using illusions to Mind Rape her enemies on massive scales. Aleema later seduced a fallen Jedi named Ulic Qel-Droma and manipulated him into killing Satal. When Ulic allied with Exar Kun, Aleema remained by his side until it was convenient to betray him to the Republic, feeding any of Ulic's loyalists to a pet of hers that sucked the life out of them. When Exar and Ulic later gave her command of Sith Lord Naga Sadow's ship, Aleema happily used it to annihilate a star cluster to cook her enemies alive in their ships.
Return of the Jedi: The non-canon novelization has its version of Moff Jerjerrod. Portrayed as an arrogant, self-important Sociopathic Soldier who joined the military for the violence, Jerjerrod saw the Rebel Alliance as something smaller and weaker than himself that he could bully with impunity. As commanding officer of the second Death Star, Jerjerrod was an enthusiastic participant in Emperor Palpatine's plan to exterminate the Rebels, viewing it as an exercise in total annihilation; his one regret was that the end of the Rebellion would mean the end of the war he loved. When the Emperor and Darth Vader were slain, Jerjerrod, enraged at the Rebels for fighting back, ordered Death Star II to obliterate Endor, intending to butcher not only the Rebels and the Ewoks, but his own men, and every other sentient lifeform on the moon, out of a desire "to incinerate something green and living, gratuitously, meanly, toward no end but that of wanton destruction. A small act, but deliciously satisfying." A petty, sadistic man with a big gun, Jerjerrod was among the cruelest and most vindictive officers the Imperial Navy had to offer.
Few Star Wars villains have had a career as varied as that of Jenna Zan Arbor. A Mad Scientist fascinated by The Force, Jenna first appeared in Jedi Apprentice, where she captured, tortured, and killed in an effort to work out how their abilities operated. Found out and pursued by the Jedi, she fled to the planet of Belasco, where she infected their water supply with a bacteria that would kill millions unless she was paid to "discover" the cure. Arrested and imprisoned, Jenna escaped custody in Jedi Quest, and allying herself with gangster and terrorist Granta Omega, setting herself up as a drug dealer before joining his effort to poison the entire Galactic Senate. When Omega died, Jenna joined the Separatists, manufacturing chemical weapons—including the gas that Durge used on Naboo's moon—for them, before changing her allegiance to the Empire at the end of the war. At the time of her eventual execution by Darth Vader, Jenna was part of the Death Star project, and was engaged in experiments in mind and memory manipulation. Void of ethics, and interested only in profit and fame, Jenna Zan Arbor was prepared to do anything, however depraved, to satisfy her curiosity.
Darth Bane is the one who both destroys and reinvents the Sith. Born Dessel to a simple miner, Bane became a soldier and eventually joined the Sith Academy at a young age. Soon enough, Bane became a devotee of the Dark Side and came to the conclusion the current Sith were weak and flawed. Bane would soon abandon anything resembling morality or compassion. When poisoned, he saved his life by slaughtering a father's three young sons in front of him, drinking in the man's agony before killing him as well. He received healing only when he threatened to torture a healer's young daughter to death. when he rejoined the Sith with the goal to purge them, Bane led them in a ritual that stripped a world of life and finally tricked the leader of the Sith brotherhood, Lord Kaan, into using a forbidden technique that wiped out the Sith and Jedi armies, leading their souls imprisoned in a horrible prison for the next thousand years.
Darth Zannah (previously known as "Rain") is Bane's first true apprentice who submits herself to the Dark Side as a young girl after she crosses the Despair Event Horizon. Proving herself to have the potential for evil, she murdered the crew of a small ship, including children, to secure passage to rejoin Bane. After ten years with Bane, any kindness or innocence Zannah once had is dead and gone. She has no compunction betraying her lover to his death, never having cared about him to begin with. When she discovers a terrorist in the same conspiracy was her lover's other woman, Zannah reveals her talent as a Mind Rape specialist: she uses her sith sorcery to destroy the woman's mind with horrible visions that make her claw out her own eyes until her mind is destroyed, save for a small pocket of consciousness where she will suffer until death. After a duel with the Jedi, Bane is critically injured. Unwilling to let him die before she has all his teachings, Zannah tricks her cousin and the same healer Bane blackmailed years ago, before she slowly hacks the healer to death with her lightsaber and uses her powers to drive her cousin into insanity so the Jedi will kill him, thinking he's the Sith Lord. While Bane is ice cold, devoid of emotion and feeling, Zannah is violent and openly cruel and sadistic, preferring to cause pain mentally. She is a worthy heir to the millennia long evil of the Sith.
Borborygmous Gog was the Big Bad of the first half of the series. A Shi'ido changeling who once served the Empire, Gog and his partner Mammon Hoole worked on the world Kiva. When Gog realized their experiments would result in the extinction of all life on Kiva, he reported this to the Emperor and carried on with the experiments while concealing the truth from the more moral Hoole. He had no compunction letting Hoole take the blame, either. Gog would continue Project Starscream, creating bioweapons that included, among others, a living planet that devoured organic life; a machine to trap people in their worst nightmares; and an essence stealer that trapped the life force of sentients in a crystal matrix. To test them, Gog regularly unleashed them on innocents while cataloging the results. When his “masterpiece,“ the living bioweapon Eppon, chose to side with Hoole's family against Gog, Gog simply killed him without remorse. He also funded Dr. Evazan’s research (see below). Combining his brilliance with an utter lack of morals, Gog sought to master the Force and achieve scientific perfection- even if the Galaxy had to burn behind him.
Dr. Cornelius Evazan is a psychotic Mad Scientist who brags to Luke Skywalker that his crimes have given him the death sentence in twelve systems (“He doesn’t like you…I don’t like you..). A Serial Killer and thug with delusions of grandeur, Evazan claimed countless victims with his depraved experiments. When his Aqualish partner Ponda Baba lost an arm to Obi-Wan Kenobi after threatening a young Luke, Evazan kidnapped an Aqualish Senator to have Ponda's mind transferred into the Senator's body, obliteraring the senator's consciousness. When this went wrong and Ponda was erased and replaced with the Senator's mind, Evazan had no remorse. Joining Project Starscream, Evazan moved to the world Necropolis where he tried experimenting to bring the dead back to life. For this end, Evazan even murdered and attempted to murder children to reanimate and fuel his personal Zombie Apocalypse.
Jedi Academy Trilogy: Moruth Doole keeps a harem of Rybet females he rapes, and he enslaves the children, making them package up the spice mined. Then, when they're old enough to challenge him, he kills them. He runs a massive slaving operation with high fatality rates, without a glimpse of remorse or humanity. He's also fond of feeding any enemy slaves to the giant spiders that inhabit the spice mines.
Luke Skywalker and the Shadows of Mindor: Lord Cronal (supposedly born as Perek), also known as Lord Shadowspawn and "Blackhole," grew up worshiping the Way of the Dark, an ideology which focused on nihilism and instilled in him the fanatical belief that the only true power was the power to destroy. Seeing the "creation" of his own daughter, Sariss, as a transgression against nihilism, he disavowed her and gave her to the Prophets of the Dark Side to be raped,even participating himself. Though Cronal initially served Emperor Palpatine, in reality he held contempt for the Emperor and plotted to overthrow him because Cronal viewed him as not destructive and evil enough for his tastes. Following Palpatine's death, Cronal declared himself the New Galactic Emperor and waged war on the New Republic. Cronal's Imperial splinter faction embarked on a campaign of wholesale slaughter against multiple worlds, conquering the Inner Rim in the process. In order to act as his puppets and decoys, Cronal kidnapped, lobotomized and mind-controlled multiple Force-sensitives to act as extensions of himself whom he could bodyjack should his own frail, elderly body fail him. His plan during the Battle of Mindoir being to take over the body of either Luke or Leia both due to the siblings' force sensitivity and to prolong his own life. Cronal also had kill-switches implanted into the entirety of his forces, and, when his attempt to switch to a Skywalker body failed, he sent them all on suicide runs against the Republic while he escaped. This necessitated the death of every Imperial troop under Cronal's command, 50,000 people total. In the end, Cronal was a man so completely nihilistic, that his ultimate goal as Emperor was to create a never-ending cycle of entropy until all of existence, including himself, was destroyed.
New Jedi Order: Onimi masterminded the most devastating war in Galactic History, who indirectly caused the deaths of trillions and the extinction of whole species, just so that he could become a god. He even tells Jaina that he's looking forward to "exterminating everyone and everything in this foul galaxy." During his Motive Rant to a captive Jaina, he does try to cast himself as a Woobie, Destroyer of Worlds, but she (rightly) just thinks he's a lunatic and is repulsed. It's made clear to the reader and both Solo twins that, by the time of the Final Battle, Onimi's motivation is For the Evulzat best. Even worse, it's also strongly implied that his plan to descend the Galaxy into darkness had actually succeeded.
X-Wing Series: Ysanne Isard is Director of Imperial Intelligence and Emperor in all but name. Along with the traditional things that come from being at the head of the Empire, like oppressing nonhumans and ordering strikes against the Rebels, and what she did to the previous people in power, she ordered the creation of the Krytos Plague, which causes infected nonhumans to die horribly, and set it loose on Coruscant before the Rebels captured it. This so that the New Republic would both bankrupt itself trying to treat the infected and tear itself apart along species lines, as resentment towards immune humans rose. It might not have gotten that bad, but that was the intent. And then there's how she left Coruscant. And Lusankya. At one point, Wedge thinks to himself that Isard might not have been evil on the scale of the Emperor or Darth Vader - aside from Luke and sometimes Leia, few people in that 'verse consider Vader anything but evil even after his Redemption Equals Death - but that was small comfort to the millions who died at her hand.
Bounty Hunter: Montross's first introduction shows him coldly gunning down a helpless bounty who's wanted dead or alive, simply for the pleasure of murder. As the man desperately pleads, his bounty is worth more alive. Montross replies "You're worth enough dead." Later on, while trying to beat Fett to the big prize that they're both after, he tortures Fett's non-combatant friend and mother-figure to find out the location, mortally wounding her in the process. Then he sets her entire space station to explode, hoping to kill Fett. He fails, but undoubtedly slaughters countless civilians who were on the station. Fortunately, he gets a karmic death when Jango leaves him to be ripped apart by the Banda Gora.
Jedi Starfighter: Captain Cavik Toth and Lieutenant Bella drop bioweapons on a town filled with civillians, and when the test is successful Bella still tries to level the city purely because she enjoys, failing only because Reti and Adi intervene. She also violently threatens her subordinates. Toth, meanwhile, kills his aids with the THX weapon simply because production is behind schedule, and develops weapons to use against the clones, testing them against innocents. Nym's aid describes him as a ruthless monster.
Emperor Vitiate is a pointlessly cruel man who sacrificed all life on his homeworld, Nathema, so he could become immortal. He mind raped Revan for 300 years just so he could get intelligence on the Republic. The Emperor periodically takes young Sith apprentices and alters them to become his Children, instruments of his will. Many of the Children are sent to the Republic as sleeper agents and often have no clue of their true nature until they find themselves compelled by the Emperor's will to kill their own friends. To complete his ascension to godhood, the Emperor attempts to destroy several planets. He attempts to destroy a massive power core on Belsavis, which would destroy the planet and several surrounding star systems. He attempts to release Sel-Makor on Voss. Finally, he attempts to eradicate all life on Corellia, one of the more inhabited planets in the galaxy and a member of the Empire at that time. If these attempts had succeeded, the Emperor would have proceeded to conduct a ritual that would have consumed all life in the galaxy to grant him the ultimate power. The Emperor is so cruel that the spirits of the ancient Sith Lords have made multiple attempts to kill him as a matter of principle.
When the same game's Darth Jadus is first introduced, he appears to only differ from his fellow members of the Dark Council in that he is enigmatic. It gradually becomes apparent that Jadus is twisted even by the brutal standards of the Sith. Jadus fakes his own death at the hands of a terrorist so he can secretly kidnap several hundred people and torture them into becoming his mindless servants. He then gives incredibly powerful Kill Sats to terrorists so they can use them to kill countless Imperial citizens, all so he can come back from the dead and save the day, increasing his political power. To prevent the other members of the Dark Council from figuring out his plans, Jadus has his insane daughter, Darth Zhorrid, succeed him on the Council as a distraction. If Zhorrid somehow manages to survive Sith politics, Jadus plans to have her killed. Jadus plans to use the power he will gain from his plans to repeat the tortures he inflicted upon the people he kidnapped with the entire Empire.