Little known facts and information regarding them along with any real world mythology they are based on. In other words, a mix of the kind of stuff you find on Wikipedia and the kind of stuff Square-Enix put into guides, interviews and of course in-game.

For character spotlight, I'd saim for the middle-characters (perhaps still playable) rather than the most famous and popular ones. So bits on characters such as Bugenhagen, the Shinra group, Adel, General Leo or Penelo.