Beerus

Beerus is a character from Dragon Ball who made his debut as the main antagonist of Dragon Ball Z Battle Of Gods and its adaptation in Dragon Ball Super. He is the selfish and ill tempered god of destruction of Universe 7 who's job is to destroy planets he believes don't deserve to live so that new ones can be created.

Trivia

 * Although it's been stated that Beerus must destroy planets so that new ones can be created this actually doesn't make any sense because the universe is endless. It's unknown whether a universe in Dragon Ball does have some sort of limit as to how many planets can exist at once and if so why the Supreme Kai's can't just stop creating planets altogether instead of having gods of destruction destroy them just so they can create more.
 * Beerus was originally going to be a lizard like villain responsible for turning the Saiyans evil. This concept was most likely revisited in the video game Dragon Ball Xenoverse where Demigra (the games main antagonist) turned other characters evil and has a final form that looks like a lizard.
 * During his creation Beerus was originally meant to be a pun on virus however Akira Toriyama (the creator of Dragon Ball) mistook his name for a pun on beer and made it so by also naming other destroyer gods and angel attendants after alcohol such as Champa (champagne) and Whis (whiskey).
 * Beerus's design was actually based on Toriyama's own cat.