I don't know whether there are already plans for this, but if not I think this is a great idea. With the legacy system now released, we are seeing an increase of changes that affects not only 1 character, but all of your characters on a specific server. What it doesn't seem to affect is the questing system. A system that works interactive between your characters, would work great along the legacy system. For instance, a choice you make on your bounty hunter, unlocks a mission on your sith warrior, that sort of thing. Or for example a quest where the questgiver mentions that your brother was an imperial agent, or that your sister was a jedi knight . A system where the choices you make, affects your entire legacy would be great!