Vegeta is the prince of the Saiyans and one of the few remaining survivors of his race. Because of his royal heritage and status as a "Super Elite" Saiyan warrior, he believes he is destined to be the strongest in the universe and vows to surpass Goku and anyone else in his way. As the story progresses he settles down on Earth.
Vegeta is arrogant, aggressive and egotistic, valuing his "Saiyan Pride" above all else. He believes himself to be superior, born to be the most powerful fighter in the universe due to his Saiyan heritage and royal bloodline. Like most Saiyans Vegeta lives for the thrill of battle. Vegeta retains an eternal rivalry with Goku, with his initial Super Saiyan transformation being triggered by his inferiority complex.
Early in the series he is unapologetically evil and murders anyone in his way. He doesn't even hesitate in killing a subordinate when he no longer considers them useful.