Fair to me!
(SPOILER)
16. What is Lightning's real name?
Claire Farron

17. Who is the only l'Cie you fight in the game?
Cid Raines

18. What song is played during the last scene of the game?
Leona Lewis...thing. Ugh, it was so horrible I forgot the name.

19. What ranking was Lightning in the Guardian Corps before quitting to saving her sister?
Sergeant

20. How many Eidolon fights are there?
Six