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.
While being a formal continuation of the Republic Senate, the Imperial Senate had little of the power it once held, having surrendered it to Emperor Palpatine. While many senators thrived under the Empire, using their positions to enrich themselves, others sought to bring down the Empire and restore the Republic, with key senators becoming the civilian leadership of the Alliance to Restore the Republic.
Senator Orn Free Taa
Orn Free Taa was the Senator of Ryloth and a leading member of the Loyalists in addition to being a strong proponent for the Republic military. Following the rise of the Empire, he continued to serve in the senate as a puppet for Imperial interests on Ryloth.
- Adaptational Nice Guy: In the Legends works, he's described as one of the most corrupt senators in the Republic (even the official online character encyclopedia describes him as such). In the Canon (which is presented via The Clone Wars), he at least cares about the survival of his people, even if he still is fairly corrupt.
- A Lady on Each Arm: He is almost always seen with at least one scantily clad Twi'lek female accompanying him.
- Ascended Extra: In the Prequel Trilogys films, he is a noticeable background senator with exactly one line of dialogue. He receives an expanded role in The Clone Wars.
- Butt-Monkey: In Lords of the Sith, Taa spends the novel being terrified and abused while being constantly dismissed as an unimportant figurehead. Vader uses the Force to toss him around or choke him a couple times, while the Free Ryloth Movement does not really consider him a very high-profile target even though he is the face of the Imperial occupation of Ryloth.
- Big Eater: In "Voyage of Temptation", Obi-Wan describes him as having a "legendary appetite". Not very surprising, considering his weight.
- Dirty Old Man: He's often seen in the company of one or two Twi'lek females who appear quite a bit younger than he is and are dressed in a rather questionable manner for someone accompanying a Senator.
- Enemy Mine: With his political rival Cham Syndulla during the Clone Wars. When Wat Tambor started bombing Twi'lek villages across Ryloth, the two came to a compromise: the Republic would withdraw their forces once Ryloth was free if Syndulla did not try to seize power for himself.
- Gonk: Most Twi'leks, male and female, have slender yet athletic bodies and are attractive. Taa is obese, ugly, and has disgusting teeth.
- Non-Standard Character Design: Unlike most Twi'leks, he has four lekku (head-tails) instead of two. Official resources claim that this is something that happens to male Twi'leks who are able to grow especially obese; lekku are mostly fat deposits, so truly bloated male Twi'leks like Orn are able to have their brow-bumps grow into secondary lekku. Additionally, in The Clone Wars, he has Four-Fingered Hands, which is unlike in the Prequel Trilogys films (where he has five-fingered hands, as is normal for his species).
- The Quisling: After the rise of the Empire, he works in a figurehead position to keep the Twi'leks loyal to the Empire as it exploits Ryloth for spice.
- Rubber-Forehead Alien: A corpulent, blue-skinned Twi'lek.
- Screams Like a Little Girl: Shows up in "Voyage of Temptation" when he and the rest of the Senators on the Coronet are swarmed by micro assassin probes. Even when one's trapped under a (relatively) indestructible glass serving tray, he still freaks out. That said, it's justified since even a single micro probe can be deadly and was still attempting to kill him from under it.
- What Happened to the Mouse?: In Lords of the Sith, he is last seen panicking aboard the Star Destroyer Perilous right before it explodes. Darth Vader and the Emperor briefly discuss his possible fate, with the latter noting that it would be in Taa's nature to find some way to survive.
Senator Gall Trayvis
A human who until recently served as a member of the Imperial Senate, representing the world of Osk-Trill. He was removed from office for speaking out against the Empire's policies, though he remains in touch by frequently hijacking the Imperial HoloNet with less-savory news about the regime.
- Bookends: His first and lastnote appearances both involve him helping lure the Ghost crew into an Imperial trap, and their subsequent escape preventing the Empire from using the trap again.
- Broken Pedestal: He becomes one to both Ezra and Hera once they realize his true loyalties and that everything he spoke for was a lie.
- Bullying a Dragon: There's no galaxy where it's safe to gloat to a superpowered teenager about his parents' deaths and then imply you had a hand in it. His face when Ezra glares back at him before he leaves implies that he realized this too late.
- But for Me, It Was Tuesday: Averted. He remembers the Bridgers quite well.
- Dirty Coward: He's wimpy and more cowardly in real life, rather than how his image on the HoloNet depicted him as fatherly and supportive. It's because he helps the Empire catch rebels that are lured out by his words, which in itself is cowardly.
- The Exile: He was removed from office and then forced into hiding for his anti-Imperial views. He's actually an Imperial agent.
- Expy: Of Emmanuel Goldstein, being a Fake Defector posing as the Voice of the Resistance to lure out real dissidents. He even seems to be modeled after George Orwell himself.
- The Bridgers were just ordinary people that made rebel broadcasts to keep hope going and to encourage action against the Empire so that people would be free from its tyranny. Trayvis is a senator who made rebel broadcasts to encourage action against the Empire so that they know exactly who to arrest.
- Tseebo was the major source of an information leak that became important to the rebels so that they knew what the Empire's plans were for a number of things. Trayvis leaked out false information to the rebels so that they could be lured into a trap by the Empire, thus, ending their operations right then and there.
- Ahsoka/the Fulcrum informant network and the senators-in-exile both preferred more covert activities and planning ahead, while Senator Trayvis wants people to act out without thinking of the consequences so as to easily find and arrest those who would commit treason against the Empire. In fact, it's implied that Ahsoka and/or Senator Organa informed Hera that Trayvis was a suspicious character before performing the retrieval mission in "Vision of Hope".
- Ezra mistakenly believed that Trayvis knew the Bridgers personally or was close to them. However, Governor Azadi did. Ezra learns about both of their possible connections to his parents through a vision at the beginning of their respective in-person debut episodes. Also, both Azadi and Trayvis are wanted former political leaders with warm color palettes and are fatherly (at least seemingly for Trayvis), but Azadi has a larger build while Trayvis is wimpy. Azadi also defiantly wanted to stay out of prison and thus initially wanted to stay out of rebel activities after his escape, while Trayvis wanted to give up easily when cornered by Imperial forces and encouraged acting out without foresight due to being an Imperial spy.
- Foreshadowing: His first appearance has him leaking out word of Luminara Unduli's survival. With the revelation that Luminara was Dead All Along and that she was part of a trap set by the Grand Inquisitor, this hinted at him trying to bait rebel groups, which was confirmed in "Vision of Hope".
- Meaningful Name:
- Maybe. He has the "gall" to "betray" Ezra's vision.
- According to behind-the-scenes material, he was called DeGaulle before he was given his current name.
- The Mole: His messages deliberately lead rebels into traps.
- Token Good Teammate: While senators like Mon Mothma and Bail Organa were more covert in spreading dissent, Gall Trayvis was much more open about his criticisms of the Empire during his time in the Senate. That's what he wanted the public and the rest of the Empire to think, so he could lure rebel cells into traps.
- Unwitting Instigator of Doom: After The Reveal that he was actually claiming to be a rebel so to lure out rebels, this gives the crew the idea to make a rebel broadcast of their own in the next episode, setting off a chain of events that lead to the Rebellion becoming more united and able to take action.
- Voice of the Resistance: Until "Vision of Hope", he's only been seen on the HoloNet as he hijacks it and provides "news the Empire doesn't want you to hear." After "Vision of Hope", he officially returns to the Empire once his cover was blown.
- Walking Spoiler: After his appearance in "Vision of Hope". It doesn't affect the rest of the show later on, however, so it's mainly for Season 1.
Senator Nadea Tural
A female Thradian who represents her homeworld of Thrad in the Imperial Senate. While initially viewing the Empire as a positive force in the galaxy, she realized the corruption and flaws of the Empire after an encounter with the crew of the Ghost. Tural subsequently became an ally of the Rebel Alliance in the senate.
- Character Death: Following the dissolution of the Senate, Tural and several other senators known to be sympathetic to the Rebellion are arrested and imprisoned in Arrth-Eno Prison on Coruscant. They are all killed when the prison is destroyed by Palpatine during a failed rescue of the senators and assassination attempt on the Emperor, with the blame pinned on rebel terrorists.
- Entertainingly Wrong: From her initial point of view, the crew of the Ghost are terrorists who rob from the Empire to feed their fellow insurgents and criminals. Tural also believes that once a vote passes in the Senate, the Emperor then enacts whatever legislation they passed while she and her colleagues never give a second-thought about it. Hera quickly sets her straight about the rebels' true nature and the lack of power the Senate holds.
- HeelFace Turn: After seeing firsthand how ruthless the Empire could be and learning how the Imperial Senate had no real power, Tural becomes a rebel and starts to secretly support rebellious activity on her homeworld.
- Humanoid Alien: Thradians are humanoid in body type, but obviously not human.
- Oh, Crap!: Her reaction to meeting Hera and the Ghost crew, who she only knows as terrorists from Lothal due to Imperial propaganda broadcasts, is to freak out and pull a blaster on Hera when she rescues Tural from a crashed transport.
- Took a Level in Cynic: When first introduced, she was an idealistic senator who, while gaining a new understanding of the Empire and the rebels' actions, did not support armed struggle against the Empire. Around four years later, she is a ally of the Rebel Alliance who suggests to Eneb Ray that they attempt to assassinate Emperor Palpatine.
Senator Domus Renking
The representative of the Lothal Sector in the Imperial Senate. In the early years of the Empire, he made a deal with mining company owner Arihnda Pryce to sell her company for her mother's freedom from a false claim of embezzlement and working for him as his senatorial aide on Coruscant.
- Corrupt Corporate Executive: Pryce sees him as this, and holds a grudge against him for costing her her family's mining company thanks to his rivalry with Azadi. She's not entirely wrong about this view, for once.
- Corrupt Politician: As per the norm for any Imperial senator who is not deluded about what the Empire is. Eventually he is too corrupt for even the Empire to ignore when he bribes another governor to drop their bid for a military base in order to get it built on Lothal. Pryce lets this information slip to the ISB and Renking is promptly arrested.
- Laser-Guided Karma: His ultimate downfall is caused by Pryce, whom he manipulated and screwed over repeatedly, which set her on the path to claw her way up to become governor of Lothal.
- Only in It for the Money: Its rather clear he does not give a damn about Lothal or its people and everything he does is to line his own pockets.
- Teeth-Clenched Teamwork: After Pryce becomes governor of Lothal, Renking despises having to work with her as she repeatedly cuts into his profits for having manipulated her and her family for years.
Senator Winmey Lenz
The senior senator of Chandrila who served alongside Mon Mothma in the Imperial Senate.
- Bitch in Sheep's Clothing: Bail and Mon Mothma regarded him as an ally in building the nascent rebellion and were completely unaware of his close ties to the Empire's secret construction projects.
- Playing Both Sides: While plotting with the Rebellion, he is also selling cheap building materials to the Empire in secret deals. It is unclear what his ultimate goal was, but he may have been hoping to trigger a war to get rich supplying the Empire.
- Stereotype Flip: Chandrila and its people are well-known for being honest and their opposition to the Empire. Lenz is a highly skilled liar and cooperating with the Empire's construction projects.
- Senator Bail Organa: see his entry on the Rebel Alliance page.
- Senator Leia Organa: see her entry on her own page.
- Senator Mon Mothma: see her entry on the New Republic Senate page.
- Senator Nower Jebel: see his entry on the New Republic Senate page.
- Senator Tynnra Pamlo: see her entry on the Rebel Alliance page.
- Senator Vasp Vaspar: see his entry on the Rebel Alliance page.