Spinning off from this month's TL;DR from Yorkie, I'd like to explore Chaos and it's archetypes.
See, to me right now, Chaos is a little anaemic in execution. Not because it's Codex is apparently a bit meh (Donkies years since I played 40k Chaos), but because the whole thing is feeling quite underserved.
But what do I mean by that? Well, if you're a Khornate Lord, you have to be a near mindless butcher, anathema to all life because just as tarts will have their trinkets, Khorne does love his skulls. Slaanesh? Dirty Boys only. If you don't do things that would make the Baby Eating Bishop of Bath and Wells blush, balk then see his brekkie for the second time that day, no place for you. Tzeentch! Best be damned good with Magic. And a Thousand Son. Nurgle? Bogies or GTFO.
Yet there's a lot more to the four. Age of Sigmar for instance is exploring Chaos in interesting ways at the moment. If you could pop your prejudice aside for a moment, I can recommend reading Call of Archaon and Call of Chaos for example. Actual chaos characters, with actual motivations! Who know!
And I think a greater variety can be translated to the tabletop quite nicely. For a start, something akin to Chapter Tactics. But rather than a simple 'Spiky Ultramarines' translation, it should focus on your army's general, and reflect their particular manner of praise.
Khorne for instance loves his warriors. Yes he does. In a purely platonic way. Yet, that doesn't mean they need all be blood mad butchers. All Skulls are welcome, but not all Skulls are equal. So offer a range of possible takes. You could take the classic well known Khârn archetype, they who slay everything. Even puppies. But you might instead opt for a 'true' Champion of Khorne, they who seek their way to Khorne's right hand by seeking out the champions of their foe, that they might lay only the most worthy of Skulls at the feet of their God. The followers of such a being would likely be inspired with each worthy addition, granting a bonus on the field the more enemy characters fall to their masters blade.
Yet another might be a tactical type - one who forgoes personal glory for the challenge of 'the few against the many', adept and renowned for reaping a fearsome tally despite their Warbands modest size.
Each archetype (and they're by no means God exclusive) would require a different army selection to get the most from them, increasing the variety of armies seen in the field.
But what do you reckon?