These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Vorkosigan Saga
Canon Sue: Cordelia and Aral seem to edge into this territory being almost unanimously admired by the rest of the characters and portrayed as unfailing sources of wisdom. Cordelia at least is still allowed to get things wrong - although nothing too great - as the series progresses, but Aral gets this is a lot. It may be an artifact of mostly seeing him through the viewpoints of his younger relatives, especially Miles, to whom he appears basically perfect.
Ges Vorrutyer gets about twenty pages of screen time, and is still a memorable skin-crawler. His creepy obsession with tormenting and torturing his ex-boyfriend Aral takes him from "academically interested in watching a psychologically destroyed Bothari raping Cordelia Naismith on his say-so" to "willing and eager to do the deed himself" in a way that leaves even the normally very calm and balanced Cordelia absolutely terrified. Oh, and guess who broke Bothari in the first place? According to Aral, Ges did it twice: once before Bothari arrived at the Leper Colony, and again after only a few scant months when Bothari was reassigned.
There's a brief but horrifying line that partially explains Vorrutyer's extensive use of Bothari as a rapist: Prince Serg liked torturing pregnant women...so Vorrutyer supplied them.
Baron Ryoval stands out as one of the worst villains of the series, and is viewed as a monster even on the Wretched Hive of an Outlaw Town planet in which he lives. Ryoval started his evil early in life, murdering his father and then proceeding (with the exception of two siblings who escaped) to either murder the rest of his siblings or else subjecting them to torture/body modification before condemning them to a Fate Worse Than Death in brothels he runs catering to sadism and sexual perversion. Ryoval is obsessed with torture and sadism both as his primary business as well as as a hobby, and employees a large staff of torture technicians, who like the rest of his staff, don't like the work, but are too afraid of what he would do to them if caught to flee. Ryoval is actually seventy years old, but looks like a young man because like some other particularly depraved people on his planet, he has had clones of himself produced (who are normal, sapient individuals) and then when they've reached a certain age, he had their brain ripped out and his implanted. He has this "procedure" done several times.
Miles had judged the hostage-problem logically insoluble; therefore, clearly the only thing to do was make it Cavilo's problem instead of his own. (from The Vor Game)
There's his verbal sparring with Cavilo earlier as well:
Elena: Damn. If I didn't know you, I'd think you were Mad Yuri's understudy. The look on your face . . . am I reading too much into all that innuendo, or did you in fact just connive to assassinate Gregor in one breath, offer to cuckold him in the next, accuse your father of homosexuality, suggest a patricidal plot against him, and league yourself with Cavilo — what are you going to do for an encore?
Note that Aral(Miles's Father) is probably bi-sexual preferring guys or possibly homosexual with a Single-Target Sexuality exception for Cordelia (Miles's Mother). They are happily married. Miles has not heard about any of this except possibly as rumours from his father's political enemies which he would probably ignore. .
Ensemble Darkhorse: Both "That Idiot" Ivan Vorpatril and Mark Vorkosigan have become intriguing characters due to Hidden Depths, and it doesn't hurt that both love to deflate Miles' ego, and know exactly what buttons to push - Mark even more so since he is Miles. Other popular bit players are Emperor Ezar and Emperor Fletchir Giaja, each of whom only appear in one book (Barrayar and Cetaganda respectively.) Both leave striking impressions of rulers who are cunning and a hint of what Gregor might become when he grows older. Miles is in awe of Fletchir's wisdom, deeming him a Worthy Opponent.
Jerkass Woobie : Ekatrin's first husband. The decay of his marriage is caused by his phyisical difficulties causeing him a low self-esteem and depression that makes him withdraw into himself and neglect his wife. On another planet besides Barrayar he might have been a tolerable husband, but the odd Fantastic Racism slowly got to him.
Not only did he neglect her, he verbally and psychologically abused her constantly. And although he did have low self-esteem, he was also ridiculously proud and terrified of what he saw to be public embarrassment - enough to make things far more difficult, demoralizing and time-consuming then they needed to be when it came to treating his illness and his son's.
The unnamed villain of Diplomatic Immunity poisoned the crew of a whole spaceship, and went on to cause the extremely horrible deaths of four people who had the bad luck to get in its way, to say nothing of trying to make a scapegoat out of Barrayar and create war between it and the Cetagandan Empire - plus that little business with the bomb in the concert hall, the last of which was purely out of spite at having been caused so much trouble by the Quaddies. But their backstory is rather tragic; as a genderless, genetically engineered servant, the ba had to spend its whole life witnessing all that was denied it - power, wealth, the right to breed - in the form of its younger, perfected sibling, the Emperor of Cetaganda. Then the late Empress, who actually did treat the ba somewhat like a 'real' child, died with her final plans unfulfilled. And, although it tried to start a new empire with itself as both Emperor and Empress, in order to bizarrely fulfill its late Empress' (and mother's) wishes, Miles also rather poignantly has the right of it: "In other words...the ba wanted children. In the only way it could...conceive."
[Miles] had slain men's bodies, and bore the mark, and knew it. He did not think he'd ever before slain a soul, yet left the body breathing, bereft and accusing.
Memetic Sex God: Ivan; on Cetaganda at least. Especially impressive in light of the fact that Ivan's Cetagandan competition has been being genetically engineered toward perfection for centuries. It's probably not just his good looks. And this reputation withstands him being dosed with a drug to ensure The Loins Sleep Tonight. Let's just say Ivan is a Cunning Linguist.
More accurately, the drug causes the reputation. The attempt to satisfy Cetagandan ghem-ladies while, er, disabled, along with some convenient lies about the Barrayaran Art of Love, make Ivan's name on Cetaganda.
Nightmare Fuel / Nausea Fuel: In Diplomatic Immunity, Ker Dubauer's lovely selection of Cetagandan bioweapons will leave you begging for a Mercy Kill before you literally boil into a steaming puddle of melted entrails. Oh, and they leave the brain intact so you're conscious up till the last minute.
Padma Vorpatril's last minutes of life, both before and after he was drugged up to the gills on fast-penta. Much more before, though, since he surely knew his captors would get him to tell them where his beloved wife and unborn son were, and kill them all - and there was nothing he could do to stop it.
What Measure Is a Non-Badass?: Ekaterin comes off as this compared to the rest of Miles's soldier/badass girlfriends, mostly because she's had a quieter, more domestic life. She has a brief Adrenaline Makeover at the end of Komarr that impresses the hell out of Miles, though, so maybe she just has that potential and never used it.
Ekaterin acquits herself pretty well toward the end of Diplomatic Immunity while Miles is incapacitated. It's also made clear in the series that there's more than one kind of badassery, and once out from under Tien and in Miles' orbit Ekaterin starts displaying hers, from proposing to Miles in front of the entire Council of Counts to fox Richars Vorrutyer in Civil Campaign to working behind the scenes on both a personal and diplomatic level to make contacting the Cetagandans about the rogue ba easier in Diplomatic Immunity. She's also super-classy towards Miles' various paramours and would-be paramours, even having his old flame Taura stand as second during her wedding. And finally, as of Captain Vorpatril's Alliance, her artistic talents - already well established by her previous appearances - are shown to be both impressive (Tej's jaw drops when presented with an example of her work) and very much in demand (Lady Alys Vorpatril mentions with pride that her rooftop garden was designed by Lady Vorkosigan.)