I'd expect such a character to have a whole bunch of Fate Points. Therefore, Pure Mortal without many stunts.
High Stealth and Guns, decent Alertness and Lore, passable Fists, Endurance, and Athletics.
Stunt ideas:
+2 to ambush.
+2 stress with sniper rifles.
+2 to Lore when declaring or assessing a creature's weakness/catch.