Hi peeps. I'm a regular from the Bay12Games forums and my noble visage was directed towards this. Just signed up to provide my take on this:
Catsplosions are maligned for their slowing down FPS, so I think they would work best as an item that slows the character down as previously suggested.
Dwarves can dodge attacks, moving into a different square when they do. They do not consider what sort of terrain it'll get them into, though, so they'll happily dodge off cliffs. Take this as you will.
Regarding the immovable stance, the ultimate defense in DF is a shield. You can mod in a creature that moves every single frame and have it attack a legendary shield user, and the shield user will block every single blow until he collapses from exhaustion. Consider that a normal dwarf will move about once every few hundred frames, less if burdened. I think someone proved mathematically that a dwarf could move at supersonic speeds using a shield. Basically, shields break the laws of physics, and of course you can't usually see whether someone is wielding a shield or not, at least until it's blocked.
Projectiles in DF are, in fact, massively overpowered. Let me demonstrate:
The flying -Iron bolt- strikes You in the upper body!
It is pierced!
Your heart has been pierced!
Your right lung has been pierced!
Your left lung has been badly pierced!
Your liver has been pierced through completely!
You have been struck down!
Simulating this would be very unbalancing, but a crossbow would be a very dwarven thing to use. Maybe you could limit it's accuracy and ammunition, and if used without ammunition it'd be a melee attack?
Magma is also very dwarven, and so are pointless things done to show just how awesome you are. Screw convection, the laws of physics and common sense, I'm going to build a giant upside-down pyramid filled to the brim with lava, and then dump it on any would-be invaders! This would be a must-have feature of a dwarven level, as well as drawbridges, traps and random junk lying about. Dwarven fortresses tend to go for very elaborate traps and do things in a pointlessly difficult way. It should be chock-full of hazards. Also, random generation would be fun.
Decorating random things with spikes is dwarven, too.
Oh, and the carp. Can't forget the carp. The bane of dwarves everywhere, they drag hundreds to their doom every year!
http://www.dwarffortresswiki.net/index.php/CarpMost dwarves can't swim very well, and carp have a massive [SIZE:] tag advantage.
What else? Hmmm, there's the nobles, their unsatiable demands and their... propensity for accidents. There's this:
http://www.dwarffortresswiki.net/index.php/EnragedAnd then, I haven't lurked enough to know the stance on this, but if there's some sort of victory animation, it'd have to be this:
Urist Duradlibash, <profession> looses a roaring laughter, fell and terrible!
Urist Duradlibash, <profession>, has murdered <name>, <profession>!
Urist Duradlibash, <profession>, has begun a mysterious construction!
Urist Duradlibash, <profession>, has created <artifact>, a <random item>.
http://www.dwarffortresswiki.net/index.php/Fey_mood#FellThat's all I can think of off the top of my hat, but there'll be more to come, I'm sure.