All spoilers regarding the Prequel Trilogy, the Original Trilogy, and The Clone Wars are unmarked. Examples relating to Disney's EU and the new movies can be spoiler-tagged if deemed necessary.
Tropes specifically applying to the characters based on their appearances in Star Wars Legends can be found here.
Species: Human (biologically modified)
A scientist affiliated with Emperor Palpatine. His presence was so secretive that not even Darth Vader knew who he was, causing him to begin investigating. He discovered that Dr. Cylo was creating cybernetically enhanced agents for the Emperor, and that Cylo himself had undergone significant enhancements and was in fact a succession of clone bodies which activated upon death.
- Beard of Evil: Both Cylo-IV and V have beards.
- Big Bad: His group is Vader's primary opposition during the events of Darth Vader.
- Cloning Gambit: He clones himself and uploads a personality and memory matrix into each successive clone when one is destroyed.
- Creator Cameo: Salvador Larroca designed Doctor Cylo's appearance after himself.
- Cyborg: He has several cybernetic implants installed into his face.
- Flesh Versus Steel: His cybernetically-augmented soldiers are Steel, and Vader's devotion to the Force is the Flesh. Vader regards Cylo's work as near-heretical.
- Mad Scientist: He is creating cyborg super-soldiers with the intent to replace Vader. He also considers that the cybernetic and biological modifications he has done to himself makes him more than human.Cylo-V: I've created a personality map small enough to be simulated efficiently. Add memory banks and plug-in calculation systems, and I am an immortal system. I am something new. And far from human.
- Morally Ambiguous Doctorate: Turns out he's a geneticist.
- Non-Action Big Bad: He's no physical threat whatsoever, relying on his cyborgs and other creations to do his dirty work for him.
- Noodle Incident: The fate of the original Cylo and his first two clones is currently unknown.
- Pragmatic Villainy: He is incapable of caring about revenge, considering it to be an "illogical grudge" and thus not worth programing it into his personality matrix. As such, Cylo-V harbors no hard feelings toward Darth Vader over his predecessor's death.Cylo-V: Be grateful I did not program myself to be capable of holding an illogical grudge. You did nothing I would not do.
- Despite this, Cylo-V clearly does not like Vader, at one point pettily complaining to Tagge about Vader not even using the honorific "Doctor" when addressing him. It's unclear if he's merely lying about not holding a grudge, if Vader's continual dismissive attitude towards him, the fact that Vader is showing up his creations, or all of the above.
- Red Right Hand: He has part of a Rodian face transplanted onto his own, with the eye easily being his most striking feature.
- The Rival: During the construction of the Death Star, Palpatine realized he made a mistake giving Cylo so much authority and free reign, as it allowed him to forge a web of connections and influence through the Empire's military and science divisions that could be a threat to the Emperor should Cylo ever turn on him. However, he simply couldn't have Cylo killed as that would anger all his allies, so the Emperor had to manipulate him into a situation where Cylo would be declared a traitor and safely eliminated.
- Small Role, Big Impact: Cylo is one of the people who designed Darth Vader's suit and helped Palpatine save his life after Mustafar. He's also one of Palpatine's closest advisers and confidants, as he knows all of Palpatine's secrets and provides advice for many of Palpatine's schemes.
- Smug Snake: He's utterly confident that his creations are the logical next step after Darth Vader, and that the Lord of the Sith is obsolete compared to them...despite none of them having Vader's connection to the Force. Vader ends up wiping all of them out, with only a brief challenge here and there.
- The Starscream: Planned all along to use his creations to overthrow the Emperor.
- Yellow Eyes of Sneakiness: His human eye is similarly colored to Palpatine's, and this suits him, considering how enigmatic he is.
Tropes applying only to Cylo-IV:
- Cold-Blooded Torture: Vader has Triple-Zero torture him to find out what Palpatine hired him for. Cylo-IV eventually cracks and reveals the location of his research base and dies from his injuries.
- You Are Number 6: Called Cylo-IV due to being the fourth Cylo clone.
Tropes applying only to Cylo-V:
- Cutting the Knot: How does he go about facing Vader when the latter finally catches up to him? The reveal of hidden combat cybernetics? Revealing a hitherto-unknown Super Prototype to fight for him? Nope. He just shuts off Vader's cybernetics by remote, having built a killswitch into them when he rebuilt Vader.
- Mr. Exposition: Explains to Vader his origin and the cloning process that extends his life. Later he provides the Emperor information on the background and ability of his test subjects during the demonstration against Vader.
- This Cannot Be!: Cylo-V's horrified reaction when Vader, after having his life support deactivated, stands back up through sheer determination.
- You Are Number 6: Called Cylo-V due to being the fifth Cylo clone.
A product of one of Palpatine's secret research programs, Morit is a human cyborg engineered and trained by Dr. Cylo alongside his sister Aiolin to potentially serve as Vader's replacement.
- Anti-Climax Boss: He'a the last surviving fighter in Cylo's group. Vader defeats him quite easily by hurling him off the Executor and into the atmosphere of a planet where he burns up; making their fight the shortest one Vader has with Cylo's creations.
- Arrogant Kung-Fu Guy: He considers himself superior to Vader specifically and to the Jedi and Sith in general. Despite only surviving his battle with Vader on Shu-Torun thanks to his sister, he very much wants a rematch.
- Blood Knight: Has shades of this since he jumps at the chance to fight Vader and later he kills the informant Inspector Thanoth handed over to him.
- Brother-Sister Team: Works alongside his sister Aiolin. Until he shoves her into lava.
- Cain and Abel: Like Aiolin he knows Palpatine will only want one of them in the end in regards to his sister. He ensures he is the one who lives by pushing his sister into lava after she saved him from death at Vader's hands.
- Cyborg: And a rather advanced one at that if what Cylo hints at is true.
- Dark and Troubled Past: His family supported the Separatists during the Clone Wars and were almost entirely wiped out. He and his sister wound up in Cylo's care and became part of one of Palpatine's pet projects.
- The Dragon: He is Cylo's strongest and most devious creation, and is the last one to be killed while confronting Vader during Cylo's attempted coup.
- Kick the Dog: Gives his sister a lava bath after she saved him from Vader.
- Kill It with Fire: He has a cybernetic flamethrower built into his arm.
- Vader uses the force to shove him off the Executor, and he is seen burning up on atmospheric re-entry.
- Laser Blade: Wields a yellow lightsaber.
- The Rival: Is competing with Vader for the position of Palpatine's top enforcer.
- Smug Snake: Morit is a violent punk with delusions of grandeur. He and Aiolin utterly fail in their mission to stop the Plasma Devils with their unthinking brutality, while Vader and Thanoth discover and defeat them almost incidental to their unrelated investigation. Vader notes that while effective, he and his sister's bladework with their lightsabers is not particularly great. When he and Aiolin betray Vader, he is not genuinely threatened by either, and only Aiolin's interference saves Morit, who repays her by throwing her into lava and believing he's "thinning the herd". And despite this, he still clings to the idea he can defeat Vader, who easily disables him and throws him off the Executor.
- Super Soldier: Trained from a young age to be the Emperor's enforcer? Check. Cybernetically enhanced? Check. (Mildly) Force-sensitive? Check.
- Technopath: He is capable of remote-controlling machinery.
- Tyke Bomb: Since he was little both he and his sister have been raised on a steady propaganda diet that consists of "Hail Palpatine!"
- Villainous Rescue: Played with as both him and Vader are on the villainous side of the saga but since he was intended by Palpatine and Cylo to be Vader's replacement, his saving Vader when the cyborg Trandoshian has him cornered comes off as this. Vader claims that he was about to finish off the Trandoshian without Morit's assistance and was angry to have been robbed of the kill.
Morit's sister and fellow test subject.
- Arm Cannon: Has missile launchers hidden in her arm.
- Brother-Sister Team: Works alongside her brother Morit.
- Cain and Abel: She is aware that at some point the emperor will only want one of the twins, so she secretly asks Vader to train her so she will be that one. Vader thinks it's pointless since both will be dead soon anyway. In the end she proves to be the Abel. While she made plans against her brother they were towards fighting him fairly, but he takes the quicker way and just pushes her off a cliff.
- Character Death: Morit pushes her into lava. Vader pulls her out and gives her a quick death after she gives him the information he wants.
- Cyborg: And a rather advanced one at that if what Cylo hints at is true.
- Dark Action Girl: She has been shown to be capable of briefly going toe-to-toe with Darth Vader and is an agent for the obviously evil Emperor.
- Dark and Troubled Past: The Astarte family supported the Separatists during the Clone Wars and were almost entirely wiped out. She and Morit were given into Cylo's care and became part of one of Palpatine's pet projects as a result.
- Fangirl: Unlike her brother, she admits to being a big fan of Darth Vader, although she also thinks of him as now being outdated in comparison to them.
- Kill It with Fire: She has a cybernetic flamethrower built into her arm.
- Know When to Fold 'Em: After a skirmish against Vader where she has to destroy a bridge to separate him from her and Morit, Aiolin realizes that they just can't beat him. Unfortunately, Morit takes the opportunity to backstab her.
- Laser Blade: Wields a green lightsaber.
- The Rival: Against Vader and the rest of Cylo's cybernetic agents for the position of Emperor Palpatine's chief enforcer.
- Super Soldier: Like her brother, she's a mildly Force-sensitive human upgraded with cybernetics to serve the Empire.
- Technopath: She is capable of remote-controlling machinery.
- Tyke Bomb: She and her brother have been raised since childhood to be utterly loyal to Palpatine and serve as his agents.
- Worthy Opponent: Despite wanting to supplant him, Aiolin respects Vader and the history he represents.
A scientist who worked in research and development for the Empire before joining Dr. Cylo's project. Like her fellow subjects, she has been heavily modified with cybernetics, allowing her to control numerous spherical drones.
- Affably Evil: During her confrontation with Vader, she begins by politely greeting him and proceeds to calmly chat with him about her projects as they fight.
- Awesome Mc Coolname/Luke Nounverber: Seriously, how fantastic is Tulon Voidgazer?
- Badass Bookworm: She's primarily a scientist but still quite useful in battle.
- Cyborg: Heavily modified like the rest of Cylo's subjects. Voidgazer's enhancements seem primarily focused on her head, with several cybernetic parts added to her head, including a total replacement of her eyes.
- Drone Deployer: Able to mentally control several hovering drones.
- Evil Genius: She's a brilliant scientist in her own right. Her reputation leads Tagge to assign her to aid in upgrading the Executor, which is vital to Cylo's coup attempt.
- For Science!: Displays this attitude. When Vader defeats her, she even takes comfort in the idea that she'll be a "Martyr for science".
- Hoist by His Own Petard: Vader defeats her by turning one of her own drones against her and then having it shoot her.
- Mad Scientist: She's a scientist, but also cold and violent enough to work with Darth Vader.
- Revenge: She is particularly eager to get revenge on the Rebels for the destruction of the Death Star, since many of her friends from her time in the Empire's research and development division were stationed onboard the station when it was destroyed.
- The Rival: To Darth Vader and Cylo's other subjects for the position of Palpatine's top enforcer.
- Worthy Opponent: Holds a great deal of respect for Darth Vader and his abilities, although that does not stop her from assuming that science will trump the Force.
Species: Mon Calamari (cyborg)
A Mon Calamari who fought for the Separatists in the Clone Wars.
- Arc Villain: He's the main antagonist for Vader and the Rebels in the Vader Down arc. He set everything in motion by using an informant to give Aphra info on Luke's whereabouts without mentioning the large Rebel military presence on the planet. Then, after Vader had wiped out most of the Rebel forces on planet, he swooped in with an army to mop-up what remained of the Rebels. He also planned to kill Vader so he could have all the credit.
- Bullying a Dragon: He's very dismissive of Vader and goes out of his way to mock him. He also thinks he's more than match for the Sith Lord in lightsaber combat. Vader ultimately proves him wrong.
- Character Death: Vader kills him in a duel on Vrogas Vas.
- Chess Master: He indirectly tricked Aphra with the whereabouts of Luke, which she immediately reported to Vader. What the informant he used forgot to mention to her, is that Luke wouldn't be alone, but with several Rebel squadrons.
- Cyborg: He's enhanced with technology similar to that of General Grievous.
- Disc-One Final Boss: He's the first of Cylo's creations Vader kills, but has the longest fight with Vader; albeit he momentarily flees after losing an arm. Vader even requests Aphra's help in fighting him, although it was more to save time rather than fear.
- Evil Gloating: Cannot resist the urge to gloat over his superior intellect. To Darth Vader, face-to-face.
- Expy: Explicitly said to be the "next step" from General Grievous, and his backstory is similar. He additionally shares Grievous's lack of defense against force powers.
- Fish People: He's a Mon Calamari, the same species as Admiral Ackbar.
- Multi-Armed and Dangerous: Like Grievous, he has four arms and carries a lightsaber in each.
- We Can Rebuild Him: He was on life support before Cylo found him.
- Win-Win Ending: He tried to engineer this on Vrogas Vas by luring Vader into a fight with a sizable chunk of the Rebel Alliance Army. Didn't quite work out the way he had planned.
Cyberanimate Trainer AI
An AI designed by Cylo to operate the bodies of various organisms.
- Attack Its Weakpoint: Vader kills its Rancor body by stabbing through the roof of its mouth and severing the link between the AI hardware and the organic brain.
- The Berserker: Its Rancor body featured adrenal implants to incite this state.
- The Brute: Out of all of Cylo's creations, it's the only one that doesn't have a real personality beyond killing.
- Cyborg: In order to host the AI, the organism must first receive various enhancements to their brain and nervous system. Naturally, Cylo takes the time to add various upgrades in the process.
- Demonic Possession: It overwrites the mind of its host when installed, though it keeps some useful elements of the original mind. Vader first encounters it wearing the body of a Trandoshan and it later appears controlling a Rancor.
- Feels No Pain: The AI removed its host's ability to feel pain, allowing it to function through normally incapacitating wounds.
- Foe-Tossing Charge: As a Rancor it pulls this off against Vader.
- Genius Bruiser: Its basic purpose is to meld an intelligent mind with bestial instincts.
- Hot Blade: Replacing its claws and powerful enough to match a lightsaber without damage.
- In the Back: Its Trandoshan host was killed when Morit stabbed it from behind.
- Near-Villain Victory: It nearly vanquished Vader in their first battle, though his actions afterwards indicate that he may not have been as threatened as he seemed.
- No Name Given: Cylo never mentions a real name for it. He may not have even given it a serial number.
- No-Sell: Its initial Trandoshan body was capable of shrugging off a direct lightsaber strike with nothing more than cosmetic damage. While its later Rancor body lacks that particular feature it does have subdermal armor that render it immune to being Force-choked.
- Resurrective Immortality: One of its strengths as lauded by Cylo. As an AI, it could easily be downloaded into a new host after a death or even recreated. This allows it to return in a new body after being killed in its first battle with Vader.
- Sacrificial Lamb: Its host is killed in its first appearance though the rest of Cylo's projects survive.