* CompleteMonster: [[AxCrazy Lijah Cuu]] establishes himself as a [[SociopathicSoldier frightening, brutal soldier]] with a mean streak a few lightyears wide to begin with. In ''The Guns of Tanith'' his true nature is solidified, when he rapes and kills a civilian woman and then murders Bragg for reporting him. He commits another unscrupulous act of violence in ''Sabbat Martyr'', where he kills Colm Corbec while trying to kill Saint Sabbat. Though he is under the influence of Pater Sin's psykers at the time, that needs something to latch on to, like already-present [[AxCrazy homicidal desires]]. In ''Straight Silver'', he almost beats Larkin, a relatively old man, to death for defending an innocent old lady and later attempts to kill Larkin in revenge while the latter lies defenseless in the middle of a seizure, only to end up murdering Sehra Muril, a fellow Ghost who just caught him red-handed. Cuu's actions naturally and effortlessly reinforce his nature as an absolute, unrelenting bastard.
* FanNickname: Liijah Cuu is, quite accurately, referred to as [=Teamkill McBackstab von FethingBastard=].
** Like you really would kill [[spoiler: Corbec]]... OH SHI-
** Fortunately played straight with [[spoiler: Gaunt]].
* MagnificentBastard: It may turn out that Mabbon [[spoiler:is a ''quadruple'' agent. First he leaves the Blood Pact to join the Sons of Sek so that he could get vital inside information on Sek's holdings. Then he defects to Imperium and gives them the information necessary to perform a raid on one of Sek's research facilities and steal tons of valuable data and research. However, it's implied that Mabbon has been loyal to the Blood Pact the entire time, and the entire operation was just a ploy to get that valuable data into the hands of the Blood Pact.]]
* MoralEventHorizon [[spoiler: Lijah "That Damn Bastard" Cuu]] crosses it when he rapes and murders a civilian woman in ''The Guns of Tanith''.
** Lets face it, he leaps gleefully over it in every book since his introduction, sometimes twice. ''Honour Guard'' is notable for being the only book in which he DOESN'T cross it.
** There's also Meryn's pension fraud racket, taking advantage of dead Ghosts and relatives for financial gain. Plus leaving Costin to die in order to keep him quiet, not to mention a few other Ghosts who hadn't even been involved in the scam.
* TearJerker: [[spoiler:Bragg and Caffran's deaths are probably the hardest hitting]].
* ValuesDissonance: The morality and attitudes of the main characters owe more to 21st century "Western society" than that of the 41st Millenium Imperium of Man, likely in order to avoid making them all completely unsympathetic. Gaunt puts up with minor heresy, rarely executes soldiers, and isn't a religious fanatic - not the kind of behavior that is encouraged in an Imperial commissar. More representative attitudes can be seen in Commissar Kowle from ''Necropolis'', a TriggerHappy psycho.
** The novels also downplay the threat of Chaos taint compared with a lot of other works in the setting - soldiers don't generally become completely unhinged by seeing one Warp-horror too many, and it takes concentrated efforts on the parts of Chaos forces to corrupt large numbers of humans. So, there is no need for the more typical Imperial ways of keeping troops in fighting shape. The Ruinous Powers are still quite potent, and the third arc deals repeatedly with the peril of TheCorruption, but humans in the series aren't ''generally'' driven to monstrous deeds just to survive.
** It's also important to note that the Ghosts are fighting on the Crusade's second front (in a time when there's probably more than one Crusade-sized effort in the galaxy). This suggests that the Warp is not quite as formidable in the Sabbat Worlds as it is in some areas, such as those around the Eye of Terror.