Dwarf Mage

Dwarf Mages don't quite fit into traditional d20 based ttrpg roles, but in this setting they tend towards being ranged fighters who excel at anti-Spellcasting operations. The primary combat ability for this class is the Dwarf Magic power Lead, which uses the Sleight of Hand skill for making Attack Rolls.
Taking the Dwarf Mage feat grants you a single power, and is a common enough dip for many classes (the Platinum power grants haste at CL 7).
Taking the Stoneborn feat after taking the Dwarf Mage feat grants you ALL the Dwarf Mage powers, but you are unable to Cast Spells or take the Patron Bound feat (or any Patron feat).
Taking the Twin Mage feat multiple times allows you to potentially gain all but one Dwarf Magic power. If you plan on getting as many of the Dwarf Magic powers as possible through Twin Mage, plan on taking either Silver or Gold powers with the Dwarf Mage feat (neither can be gained through Twin Mage).
If using the Stoneborn feat you DO NOT HAVE TO TAKE TWIN MAGE, and the best classes to combine with are Master of Weapons CC, Melee CC Fighter, and Precision Fighter.
If using Twin Mage, this class can be combined with just about anything except Spellcasting classes (with the notable exception of Lucky Bastard), but is still well suited to the same classes as the Stoneborn.
Primary Stat- DEX (CHA and INT are also fairly important, and WIS works reasonably well)
Focused Skills- AT LEAST Sleight of Hand, Dwarf Magic, and Defense, but Insight, Stealth, Survival and Acrobatics are all pretty useful
Feats
Dwarf Mage
Focused Skills (Favored Arms if planning on using weapons or unarmed)
Stoneborn or Twin Mage (take multiple times)
Increase Pool (if you need more PP)

This class REALLY benefits from being used for Combat Maneuvers, so definitely consider...

Maneuver Specialization (acrobatics is one of the better options, but bluff also can work)
Maneuver Mastery (Push, Grapple, any)
Deadly Maneuver (take multiple times)

Check out the Unarmed Fighter class to get a few more feat ideas, the two classes only work reasonably well together, but share many of the same feats.