Son Goku is the main character of Dragon Ball Z, famous for his power and ability to adapt to enemies quickly. He's not as serious as Vegeta, and enjoys fighting and training. Vegeta is the second main character for Dragon Ball Z, being Goku's rival. He refers to Goku by his saiyan name, Kakarot. He's usually serious, and spends his time training to get stronger, determined to defeat Goku in battle.