Broli, The Legendary Super Sayian

Broli was born with a power level over 10,000, and because of this was considered a threat by the King Vejita, who thought the baby Saiya-jin would grow up to be more powerful than his son, which he was and would be throughout his life. Before he was supposudly assassinated, along with his father, he developed his hatred for Kakarroto, which, from what I can tell, developed because Kakarroto was crying so loud and so much that it forced Broli to cry, and apparently he did not like that one bit. (Must be a male thing...) So now Broli hates Kakarroto and would forever remember him and want him destroyed, though he wouldn't realize it until he met up with him years later. After their 'assassination,' Paragas and Broli were dumped much like garbage. When the planet Vejita was soon destroyed after that, Broli sort of 'woke' up and went on a berzerk crying spree of sorts, grabbed his father, and left the planet as it was annihilated by Freeza, protecting he and his father with his incredible power. They traveled through the universe and what not, Broli destroying almost everything he laid eyes on. Eventually, Paragas got a scientist to create a device with which he could control Broli (the headband tiara like thing he wore), and, in his hopes, take over the universe. I'm not going to explain any further, you'll just have to see the movies for yourself.