Imagine if we could unlock more traits by doing this or that (challenges, quests, sightseeing, etc) and the traits would be treated similarly to BLU spells in FFXI (you have X amount of traits, but you can only pick a certain amount. I've not played other MMO games to the same extent as FFXI and XIV, so I'm unsure if they already have this), or anything that could change abilities/spells in one way or another. A trait to boost the AoE range of Fire II, for example. Another trait to give Surecast the added ability to allow BLM's to cast spells while moving.

The more beneficial the trait, the harder it is to obtain. Nothing like requiring you to beat Savage or EX Primals or anything. Just need to farm for a pop item from somewhere and then pop a NM that is roughly around the same level as an S rank (though not to the extent of requiring an alliance. Only the party will be able to attack the monster, too).