I'm liking and looking forward to all this detail .... did I miss a bit at the beginning? If so I'm sorry. Do we get to play the ToH as a stand alone with a saved/rolled up OC character? Or does this mesh with the OC and we have to play the whole campaign to see all the new content? Either way is cool and I'm looking forward to some high level game play 
Both! 
The ToH is going to be released first as an entirely stand-alone module that can be played as-is. While the main campaign/sequel to MotB/MoW development is still going on in tandem, the Tomb is serving as a test-bed for the new systems we're adding, i.e. thirst, food, and possibly spell components. It's also a bit of a teaser for the full campaign, and it's release ahead of the larger project will allow us to make tweaks based on player feedback to some of the core game mechanics. There are even some "Easter-egg" items a player will be able to ONLY find in the Stand-alone ToH release which they'll be able to use in the full campaign, Golden Pantaloons style. 
ToH will be a major plot-point - an entire chapter - of the new campaign, which the antagonist uses to try and kill the Knight Captain off.
Reference the lines; in my humble opinion, in all the text the PC comes across as a bit of a tosser. Could they be less .... well less, if you get my meaning. For me, very strongly personalized text decreases immersion. Softer text can be diverse and alignment focused but allows more scope for the player to own the response in the context of his/her vision of the PC.
Does that make sense? I've been to the fridge once or twice this evening.
PJ
[Edit] I wanted to use Tw*t but the forum won't let me 
A bit of "fridge horror" setting in? Mwhahaha! Puns aside, I will give some serious consideration to adding some more "detached" dialog options - for players looking to speak more with their own voice.
We're a long way from finalized on the dialog, much of what you see is first or second draft, so there will certainly be changes. We do have someone who's volunteered to do some editing, but we're holding off until the chapter by chapter locations and plot points are more settled, lest we end up doing work for areas and conversations that end up cut due to time and budget.
I am feeling like a break tonight, so let's take a moment to examine the Knight Captain's life in brief:
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One thing to consider about the KC's sarcastic tone is everything the poor sod has been through. At this point, the Kalakcha has to be getting more than a bit cynical, or he/she would go insane/collapse emotionally. When you consider the KC's lot in life, being a smart-arse becomes a survival mechanism. Their entire existence has been a case-study in "from-bad-to-worse."
He/She began their adventure as an orphan exiled from their hometown by their own foster-parent, (after potentially watching their childhood crush die), was shortly thereafter framed for murdering an entire village, used as a pawn by both Neverwinter and Black Garius, watched Shandra Jerro die at the hands of her own grandfather/great-grandfather - in the act of saving them, fought a war against a horrifying eldritch abomination, was betrayed by at least two long-time companions, had the ceiling dumped on their head as a reward, and finally watched many of their companions die protecting them, (Including possibly their first real lover).
And that's just Book 1.
By the Knight Captain's second tale, he/she found themselves kidnapped by polymorphed gargoyles, endured ad-hock open-heart surgery at the tender hands of Nefris, was made the unwilling host of a horrifying, life destroying entity, regarded at best as a serious threat in the Unapproachable East, simultaneously manipulated by a cabal of Red Wizards, a dead deity's minion, a fanatic Half-Celestial (with an impossible agenda), a Titan Demi-lich, a Wyrm Blue Dragon, a Fallen Solar, a coven of man-eating Hags and no less than two gods. Also, we'll note that the poor Spirit Eater - an endearing title if there ever was one - had to commit quite a laundry-list of highly amoral acts in the process of saving his friends, surviving the long chain of entities who'd just as soon see them dead, and twisting the machinations of those using him/her to save their very soul from oblivion.
By Book three, the KC is de-powered substantially after the separation from Akachi, being slowly driven insane due to a cursed domino mask, separated from their entire circle of friend (and possibly their new/first lover), and again finds themselves a chess piece in a deadly game between a cabal of were-rats, a vampireized Manshoon clone and a horrifying Demon looking to kill all of the above, protagonist included. For allies, the KC has fire-forged friends and lovers replaced by an amoral former assassin (who near everybody in Westgate wants dead), a severely disagreeable Tyrian cleric and a washed-up fallen Paladin - with a serious drinking-problem. Things look bleak. With this band of misfit toys, the Kalakcha has to play the competing agendas against each other, outwit a creature who annihilated Elminster - twice - and somehow un-curse themselves before they go stark raving mad.
Now we get to Book 4 (Our Story), where the poor KC, having been through all of that, begins the tale nearly dying to Nightmask retaliation, returns to a less than pleasant homecoming in Neverwinter, becomes a pariah due to the machinations of a Cambion - who's all but taken the place over - (and is considered a hero of Knight Captain proportions by the general population no less), gets sent on a series of deliberate suicide missions, has their reputation tarnished in a chain of out-of-context distortions and winds considered by the population of the Sword Coast to be a Black Network level threat. Amidst all of that, they have to deal with a foe who is their true equal in not merely physical terms, but at the game of Xanatos Speed-Chess. In The Kaiser, The Knight Captain is opposing someone capable of matching his/her ability to play sides against each other, making this quite possibly their deadliest foe. Our hero has stood down stronger entities - even gods - but this creature can match the KC in manipulation - which as we've seen in the entire story, has been the TRUE power of our hero.
When one considers the biography above, (which is in reality a testament to human suffering), a narrative that our protagonist only survived by outwitting everybody and everything they've encountered, The Knight Captain might be forgiven for having a few jerkish tendencies - developed purely as a coping mechanism.
The Kalakcha's entire story reminds us of "The Odyssey." He/she simply can't catch a break, and when they do, often times they screw it up through their own missteps. While the protagonist is truly a legend, they have real flaws, and even on a good play-through must delve well into black and grey morality to survive. Like any real person, they're exasperated by a lifetime of torment and mental abuse. They've been the playthings of fate, have been subjected to every imaginable injury and suffering, watched their friends and/or lover(s) die and their typical reward is mere survival. Even a lawful-good paladin is going to show some rough edges after that level of emotional trauma.
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I had a good time writing that.
It helps me clarify the mindset of our hero after dealing with so much in a short life - they're still a young adult at this point in the story.