I started a post long ago about this matter, since fee for extra characters was too high, should at least give it a good use to have multiple characters.

Something i suggested about it, was to allow us to pick wich character to log in and let us control as we normally do, and pick another one (AND ONLY 1 AT A TIME) to follow us as somewhat what NPC fellows were in XI.

allowing us to do the quest on both chars at same time and missions and what not, that would be awesome... if you ever played a gamme called "Secret of Mana (seiken densetsu II)" from SNES you get my idea.