I was being polite in my previous answer. I only played the first game of the Final Fantasy XIII series, I admit, but I'm not going to endure two more sequels to a game I detested to find out that Lightning's paper-thin personality actually has the depth of a small puddle of water, if even that.
This isn't a singular opinion, part of the gaming press
openly mocks this. I've heard that in Lightning returns her lack of personality is even part of the plot but that's as far as my interest for that game went.
If after 20+ hours of gameplay I still see no semblance of a personality in FFXIII, just a "character" being tough and cold to everyone around her, then you lost your chance to gain my interest.
I've seen better personalities in the Tales series, which I consider to be somewhat of the Mc Donald's of jRPGs. Or even in really mediocre jRPGs like, let's say, the first Legend of Heroes on the PSP which was an average cliche game that didn't stand out in any way.
If you've had a very limited exposure to games in general then I can understand why seemingly a powerful female character with nice hair could seem attractive to you as a character, but if you expand your jRPG knowledge a little bit and play a game with decent characters like the Last Story, as an example, and afterwards still believe Lightning is as good as you say, then I honestly think you have very poor taste and judgement.