Vegeta

Vegeta (ベジータ), or Prince Vegeta, is the prince of the fallen saiyan race and arch-rival to Goku. He is the eldest son of King Vegeta, the husband of Bulma, the father of Trunks and Bulla, and the great-great grandfather of Vegeta Jr. Alongside Goku, Gohan, and Piccolo, he is easily one of the most prominent characters in the series, receiving more character development after being introduced than a number of other characters.

Regal, egotistical and full of pride, Vegeta was once a ruthless, cold-blooded warrior and outright killer,[4]  but later abandons his role in the planet trade, instead opting to remain and live on Earth, fighting alongside the Z  Fighters; all the while striving to become the universe's most powerful warrior, specifically with the mission to defeat and surpass Goku in power.

Goku wanted to give up the Z leader title to Vegeta, but he refuses claiming a saiyan like him wouldn't take such a title.

On a normal day, Vegeta meets Android 22. Vegeta couldn't defeat the android and calls on Goku to return. Later the two do the fusion to form Gogeta. Gogeta is no match for the android either. Gogeta is beaten up and faints. Android 22 kidnapps Gogeta and tries to make a clone out of him. The Process fails and instead of one clone two are formed each half the power of Gogeta. Gogeta later wakes up and is defused, so Goku and Vegeta escape the android's lab.