Attributes and skills are a character’s basic statistics, but what really makes individuals different are their Edges. Even two legionaries in Weird Wars Rome with identical Traits play vastly different depending on the Edges they take. One might focus on Leadership Edges that lets him rally his fellow soldiers while another concentrates on taking out large numbers of foes at once with Sweep or Frenzy.
Characters get Edges by taking Hindrances (see page 9), from racial abilities (such as Humans’ Adaptability, page 16), or Advances once play begins (page 54).
A comprehensive list of Edges starts on page 37. Your setting book likely has additional abilities specific to that world or genre as well.