* AlternateCharacterInterpretation:
** Amberley can be seen as enjoying Cain for his abilities and occasional company, but some lines make her look like a ClingyJealousGirl, notably when she mentions she'd have found out if Cain was really trying to seduce women he met.
** Cain is a DirtyCoward, a LovableCoward, TheSoCalledCoward, or went through those steps along the way towards his retirement.
** It ''is'' possible to interpret his monogamy post-''For The Emperor'' as simply his self-defense instincts kicking in: "When dating an Inquisitor, it ain't over till ''she'' says it's over!" (His comment about only having room in his life for one lethally dangerous woman comes to mind.)
* BadassDecay: Averted:
** The Cain novels are more or less the only ''Warhammer 40K'' media that ''convincingly'' continue to portray Necrons as horrific monstrosities to be feared. Cain has only pulled off one win out of three encounters with the Necrons (and only by blowing them up from orbit), as opposed to his constant success against just about everything else. They are also the one threat thus far that he has adamantly refused to stand and confront, reputation be damned.
** The novels are also some of the few 40K works that manage to juggle presenting ''all'' of the main factions as badasses. The one exception is the Eldar, which haven't been featured except for Cain's mentions of his time as a prisoner of the Dark Eldar, which he still has a bit of PTSD over.
** The Orks are a more... interesting case. While they are more often than not the "Original Antagonists" that Cain finds (only to later stumble upon the real threat (Necrons or Tyranids), they ''are'' considered the comic relief army in 40K, and the 597th are considered experts at fighting Orks, so it gets played with a little.
* FunnyAneurysmMoment: If you read in continuity order; an InternalHomage in publication order. In ''Death or Glory'', Jurgen is [[HardHead mostly uninjured by a blow to the head]], and Cain says, "It would probably take a bolter shell to crack that thick skull of his." In ''For the Emperor'', Jurgen's skull is fractured near-fatally by...a bolter shell that glances off his helmet.
* GeniusBonus: Overlaps a lot with the {{Shout Out}}s on the main page.
* IronWoobie: Issues of self-esteem are the least of humanity's worries in the Warhammer 40K universe and so it's never emphasized in the books, but Cain has enough trust issues and paranoia to disturb [[Literature/TheDresdenFiles Harry Dresden]], and a self-esteem so low that it should be measured in the negative. He goes through his entire life convinced that no one could or should care for him personally, unable to connect with people on any meaningful level, unable to ever credit that he's a remotely decent person or so much as pat himself on the back for the ''billions'' of lives he saves, and terrified to trust anyone with his thoughts, lest he be shot for cowardice and deceit. The closest this ever gets to a LampshadeHanging is when, at their second meeting, Amberly gently implies that she isn't fooled by his facade and suggests that he could try being himself. He practically shits his pants thinking that she's a psyker and is going to have him killed, and he never actually takes her into his confidence even after a century of romance. That's ''sad.''
* MemeticMutation: One of the few memes originating from Wiki/TVTropes: it has become tradition to write '''[[FakeUltimateHero HERO OF THE IMPERIUM]]''' after Cain's name whenever he appears on another page.

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