Ciaphas Cain/Heartwarming

Commissar Ciaphas Cain, HERO OF THE IMPERIUM!, has a couple as well. ""I'd like to go with you, sir. I wouldn't trust any of those frakheads further than I could throw a Baneblade, if you don't mind me saying so, and I'd feel a lot better if you'd let me watch your back"
 * Jurgen proving his loyalty to the Commissar by volunteering for a suicide mission in For The Emperor.

I was touched and I don't mind admitting it. We'd been campaigning together for the best part of thirteen years by that point, and faced innumerable perils together, but his loyalty never ceased to amaze me. Probably because the nearest I've ever got to the concept myself is looking it up in a dictionary."

"General Kolbe swelled a little with paternal pride. I was to learn later that his youngest son's decision to join the praetors rather than the military had rankled for some time, and that the incident at the bridge had initiated a reconciliation that both would have been too stubborn to try for under other circumstances, so at least some good had come out of it. (Other than a pile of dead heretics, of course, which always brightens the day.)"
 * When you consider that Jurgen, as a blank, naturally creates a sense of mistrust and dislike in others--and then there's his infamous odor--Cain's simple kindnesses were probably the first time in his life anybody treated him like a person. And despite any number of opportunities where Cain could have thrown Jurgen to the wolves (or tau, tyranids, necrons, cultists...), he never does. This time, methinks the commissar really doth protest too much...
 * Well, the first time they met Cain DID sort of leave him to be torn apart by a horde on tyranids. He did come back to save him, though. (Albeit because he was chased that way by an even bigger horde.)
 * It's quite subtle, but being responsible for the reconciliation between an estranged father and son in The Traitor's Hand.

""You can accuse me of anything you like," I said, playing to the emotions of the troopers with me with the ease of long practice. "But you will not disparage Colonel Kasteen in my presence. She's one of the finest soldiers I've ever had the privilege to serve with, and the regiment she leads is among the best in the galaxy." I holstered my pistol with what I considered to be a suitably theatrical gesture. "No doubt this farcical situation has warped your judgment, along with your manners. When you calm down I'll expect an apology on her behalf. Failing that, I'm sure we can settle the matter quite amicably on the dueling field.""
 * Near the end of the same book Tomas Beije insults Colonel Kasteen in her absence. Cain's response? Challenging him to a duel.

"These days, I understand, "Cain's Round" is a time-honored tradition of the 597th, and the competition for the extra ale ration is as heated as ever. I suppose there are many worse ways one could be remembered."
 * It doesn't hurt that Cain is fairly certain that his opponent is comically outmatched against him. Cain is considered to be one of the best chainsawswordsman in the Imperium, his opponent, not so much.
 * The next time someone insults Kasteen, in The Last Ditch, it only takes Jurgen mentioning the challenge from last time to get them to stand down.
 * His decision to send back the wounded with an escort even though it means cutting his available forces in half in Caves of Ice. He might rationalize it with believing that the threat was over (the threat is never over), but considering that the average Commissar would have just executed the injured for being dead weight, it's a welcome touch of human decency in a universe so often lacking it.
 * Near the beginning of the first book, Cain notes that one measure he instituted to expediate the merging of the two halves of the 597th was a weekly reward of an afternoon's leisure and an extra ale ration to the most efficient platoon in the unit. His subsequent lines are one of the few times he doesn't second-guess or deride one of his actions, a rare hint of true pride from him:

""Commissar sends his regards.""
 * Slightly meta- Amberley Vail, despite all the gentle carping at Cain from her editor's high seat, does two incredibly dangerous things for an Inquisitor- she acknowledges on record that she associates with a coward and secondly, she's acknowledging this in front of a readership of Inquisitors. If it weren't for the fact that you feel that she's editing the books for Cain after his death as a final love letter to and for him, it would be Too Dumb to Live. Instead, it's ridiculously sweet.
 * Although if you compare some of the inquisitors in other 40k media working with Cain would only really offend the incredibly puritanical seeing as other inquisitors are known to work with daemonhosts.
 * Also note the reason for editing the Cain Archives: it is stated in the first book Amberley Vail's work is to get behind the eyes of one of the most celebrated HERO OF THE IMPERIUM!, so as to understand the conditions which might produce more of them...
 * Every single time Cain slips up and reveals he's not the selfish Dirty Coward he paints himself as (feeling guilty that he doesn't remember a guy who died under him eighty years ago, thinking a victory was due to enemy error rather than the considerable morale boost caused by his presence, trying to find a way to take out a tank swarmed by allied troops instead of shooting them and the tank, infact, even BOTHERING to think of saving the troops swarming an enemy tank instead of just blasting everything away, tank and troops, as Amberly noted was what a typical commissar would do, is likely what makes Cain a Father to His Men. Oh, and the troops go through it safely. Him on the other hand....).
 * Evolves even further by Cain's Last Stand, when he's become a Cool Teacher. It seems that every time his little cadets are mentioned, he leaves some hint that he cares a good deal for them (be it teaching them not to get shot in the back, or paying attention to them on an individual level). The scene in the Caf, where he picks out each kid's face after first hearing rumors of a Black Crusade, comes to mind; but by the time  dies, Cain's reactions have risen right into Papa Wolf territory. To top it off, for once he barely tries to belittle this side of himself.

"Cain: Please don't treat Jurgen like one of your household servants. He's an Imperial Guardsman, and the aide of a commissar, with an exemplery record of courage in the face of the enemy. He deserves a bit of respect."
 * In The Emperor's Finest snooty noble brat Mira (currently Cain's lover) snaps angrily at Jurgen when he brings Cain's tea in one morning (she's not a morning person herself). Cain quickly placates Jurgen's hurt feelings and as soon Jurgen leaves the room he tactfully but firmly defends him to Mira. It's startlingly sincere, especially when you consider how people normally react to Jurgen.