Thank you all for your advice, now I think I know what element to choose, and regarding to choose between Sol or Tsuku .. ugh, I have no idea, I've been seeing the skills of both and I think that if you dont have any good light hime (I have Demeter but hey, it's not the big thing either) I dunno if Tsuku will help me in the beginning of my light gang. Anyway, as nonsensei said, "he" has the last word.