Vegeta | Dragon Ball Z

Vegeta, the prince of the Saiyan warriors and one of the last of his species. 

If you know nothing about Dragon Ball Z, he was brought up to be a ruthless conquer of worlds (basically a space Viking), but his planet was destroyed when he was a boy and he ended up being raised by the man that murdered his father and countless other Saiyans. He was introduced on the show as a terrible villain, as the show went on he helped the heroes fight the man that destroyed the Saiyan home-world and relocated to earth and had a family. 

There's is a lot more to the story and to the character but Vegeta is one of the coolest characters on the entire show.