As the new updates are coming, like character lock items, it mean some chars may become unique! since they will have some serious stuff locked to him.
For this and for more safety, I believe that would be AWESOME and tool to lock each character with a password. In case of hacked account for an example, password will be necessary to delete the character.
Also, a Password to log-in the game as many games work
Even you're logged on your aco-_-, you still need a password to "enter" in the world.
Turning back in case of hacked account, your character and stuff should be very very safe!