Account wide emblems/titles/ and badges
Now I don't know how difficult it is to make this happen but here is my suggestion
Emblems and Titles are pretty self explanatory, it's just a hassle getting them on each and every character.
Now for the badges. let's say someone has a full stack of legendary badges on their account. it's the same badge menu that you slot the badges in BUT it works for the entire account instead of one character. Now to stop a level 1 character getting the buffs from a full legendary badge set the buffs would be inactive until they reach level 45. They would only get the buffs from the inferior badge tier, then once they hit 50 they would get the buffs from the average tier, 55 Superior Tier, 60 Rare tier, and finally 65 for the full legendary badge buff that they already have equipped.
It would help greatly not having to swap badges back and forth, and risk accidental deletion of badges.
Edit: Another suggestion for Emblems could be to make the Emblem Level account wide, but we have to get the emblems we want to use on our other characters.