(Rickvoid is correct. Having the same alignment as a comp makes them less likely to attack you.)
All right, screw it, lets just go with the Khazad. Now, to pick a leader. First off, we have this dapper fellow: Arturus Throne!
His traits are Industrious (Halves time to make wonders, plus workers work 10% faster) and Organized (Which halves Civic upkeep)
Now for our second option: Kandros Fir!
This dorf has the traits Aggressive (Gives all units +20% strength) and Financial (Every plot that's making two money automatically gains another money. So a 2 money tile becomes a 3 money tile, etc.)
Now, being Rise From Erebus, there are two additional leaders, who each only have one unique trait. However, they can gain other traits if we can accomplish some achievement. What are the achievements? I have no idea, so we may be stuck with one trait for a while.
First of the newbies is Athel Revus!
This dorf is a bad dorf. He's Evil, in fact. He also has the Slaver trait. (Everytime we conquer a city, it loses half of it population points. For every two pop points lost, a slave unit is made. Slaves are basically slower workers. Also, all units have a 15% chance of making a slave after combat)
And the last, but certainly not least: Reorx Veinhunter!
He's Neutral, don't worry. He has the Veinhunter trait. (Basically like financial, but with production instead of commerce.)
So, we have our choices. Dorfs of the world... VOTE!