Here's a fun topic that may even be constructive for the developers.
So lets stick to an easy to read format like this!
1: Favorite Final Fantasy
2: Favorite feature that you'd like to see in FFXIV or feature you wish would've been included from your favorite Final Fantasy*
Here I'll go first~!
1: Final Fantasy IX
2: Tetra Master (Or if I was saying a feature I wish they would've implemented already I would say the way you learn abilities in IX from weapons instead of the way the armory system works now)