Curate, connect, and discover
Is Lucy’s luck ever really explored? They hint at there being something special, especially around the Tenrou Arc but nothing ever really comes of it. I think it would have been neat to take that plot device and actually go somewhere with it, Celestial Spirit Magic as a whole really could have gotten more development, I think. The idea of it has so much potential and the Heartfilia family history too, a matrilineal line of celestial spirits who may or may not come from nobility in a country where the Princess/Queen is also a celestial spirit mage? (was that ever confirmed in the manga or it is it anime only?) I guess the worldbuilding in general is a lot of wasted potential. Mashima gave us such a wonderful world and then never really explores it, kind of reminds me of the lost potential in Naruto and its political landscape which could have been so interesting and then was ignored in favor of cliche shounen power boosts and big energy/monster fights.