Lord Beerus is Universe 7's God of Destruction, lorded with the ability and position to destroy any being, planet, or universe if allowed to go all out, his attendant being the angel Whis. He is Universe 6's Champa's twin brother, having the near same looks as him except being much more lanky.
Beerus is a lazy, grumpy selfish cat with an occasional affection to being playful and eating Earth's food; being the only thing that keeps him from outright destroying Earth at all. He sought out the Super Saiyan God after having a premonition of doing battle with him. After said battle, he went from less of an antagonistic role to more of an anti-hero. Rather doing anything to actively help, he'd rather stay on the wayside until a higherpower commands him to do whatever they want.