It has been recently revealed who fat Beerus(Champa) and waifu Whis(Vados) are-the God of Destruction for Universe for Universe 6, and his attendant. While we don't know nearly enough to guess his motives, we do know this: Champa is Beerus' brother, and Vados is Whis' sister. I've been wondering how they can be related if they're from different universes...and I think I know. If Beerus and Champa are siblings, that means they have parents. We know they were not always Gods of Destruction, as Whis mentions he trains successive Gods of Destruction. Now, their universes(six and seven) are twin universes.
So what if they inherited the job from their mom and dad? Imagine it: millions or even billions of years ago, the previous Gods of Destruction were Beerus and Champa's mother and father respectively. One of their parents from Universe 6, the other Universe 7. They married, and twins Beerus and Champa were produced. Now, about Whis and Vados: I think that either its a similar scenario, OR they come from an unknown "universe" that is above the other twelve in hierarchy? Universe Zero, if you will. And its this universe in charge of the other twelve, possibly even creating them
I guess we'll have to wait until at least the Champa arc though