Goku is the main protagonist of the Dragon Ball metaseries.
He is a Saiyan, originally named Kakarot, who was sent to Earth as a baby and raised by his adoptive grandfather, Son Gohan.
As the prince of a demolished Planet Vegeta, Vegeta is initially introduced as an unrepentant villain. Judging from his evil intentions before joining the Z Fighters, Vegeta has been consistently characterized as extremely arrogant, vengeful, and at times, sadistic.
Piccolo from Dragon Ball is a Namekian, a green-skinned, humanoid alien with a strong connection to the Dragon Balls and a history of both rivalry and alliance with Goku. Initially introduced as a villain seeking revenge, Piccolo becomes a key ally, mentor to Gohan, and a powerful fighter in the Z Fighters' battles against various threats.
Frieza is a major antagonist in the Dragon Ball franchise, known for his immense power, cruelty, and role as a galactic tyrant. He's the main antagonist of the Frieza Saga and a recurring villain throughout the series, often seeking more power and revenge. Frieza is feared for his ruthlessness and is one of the most powerful beings in Universe 7.
Broly is a powerful Saiyan with a unique and uncontrollable power. He is a kind-hearted Saiyan, but his immense power can cause him to lose control and rampage when pushed too far.
Gohan is known for his immense hidden potential as a Saiyan-human hybrid. He is the eldest son of Goku and Chi-Chi, and the older brother of Goten. He possesses incredible strength, speed, and durability, with his power often revealed during intense moments of rage or distress.
Goten is a Saiyan and Earthling hybrid from the Dragon Ball universe, Goku and Chi-Chi's younger son, and Gohan's younger brother. He's known for his youthful appearance, kind heart, and his ability to transform into a Super Saiyan at a very young age. He's also adept at the Fusion Dance, allowing him to combine with Trunks to form Gotenks.