Lightning Farron was a soldier in the Guardian Corps, tasked to protect the people of Cocoon, until a Pulse Fal'Cie was discovered near her home town of Bodhum. Her sister, Serah, unknowingly approached the Fal'Cie and was branded, given the fated mark of a l'Cie.
The Sanctum ordered a Purge of all the residents and anyone who came into contact with the Fal'Cie, and so, Lightning boarded the Purge train to find, and ultimately, save her sister.
Orphaned at a young age, on the outside she appears cold and ruthless, unable to show emotion because she had to be strong for her sister. Underneath it all however, beats an unyielding heart, strengthened by her loyalty to those she cares for and her duty to protect her home and its people. In the face of adversity, she finally realises she can rely on others and, with their help, can achieve the impossible and change her fate.
Did You Know? Lightning is the second female protagonist in a mainstream numbered Final Fantasy game, the first often considered to be Terra Branford from Final Fantasy VI, although that game didn't really have a clear protagonist.