Broly

Broly is one of the anti-heroes from the Dragon Ball game series. He is an abnormally powerful Saiyan who is exiled to the wasteland planet Vampa by King Vegeta out of fear of his power. He spent most of his life on Vampa under the mentorship his father Paragus (who want him into becoming the ultimate warrior for revenge), but despite emotionally scarred by his father's abusive upbringing disciplines via shock collar, Broly remains completely devoted to his father.

Years later, both Saiyans were later found by Cheelai and Lemo and recruited into the Frieza Force by Frieza himself. On Earth, he would be sent to face Vegeta then Goku, where he adapts and holds his own against them in a fierce battle but was slowly losing self control. After Frieza slayed his father, Broly was provoked to transform into a Super Saiyan and went on a rampage against Goku and Vegeta and then Frieza.

He was then confronted by Gogeta (a fusion dance of Goku and Vegeta), where the fought to a standstill until Broly transformed into the Legendary Super Sayian. Gogeta responded back by transforming in to Super Saoyan Blue and easily defeats Broly, until Broly was sent back to Vampa by Cheelai to save his life. Goku visited him some point after that, offering him supplies from Earth and help to control his power, which formed an interesting bond between them.

History
Broly was born around the same time as Prince Vegeta IV and Kakarot with a power level of 10,000. When this was discovered by King Vegeta, he sent the young Saiyan to planet Vampa, fearing both of Broly's latent abilities, and that his immense power would be a threat. Broly would spend years living on Vampa, alongside his father Paragus (who manages to track him down), who would train him into becoming the ultimate warrior.

Broly spends the next several decades living in exile with Paragus being raised as a weapon of revenge against King Vegeta until they are rescued by the Frieza Force soldiers, Cheelai and Lemo, who quickly befriend Broly. Recruited by Frieza and going to Earth, Paragus unleashes Broly upon Vegeta to get revenge. Broly quickly adapts and holds his own against Vegeta and Goku but gradually loses control of his mind and rage.

Then Frieza kills Paragus to provoke Broly into becoming a powerful Legendary Super Saiyan. In this form, he is able to defeat Goku and Vegeta in their Super Saiyan Blue forms, forcing them to retreat and fuse into Gogeta, leaving Frieza at Broly's mercy. Ultimately, Gogeta easily defeats Broly but Cheelai and Lemo manage to use the Dragon Balls to transport Broly back to Vampa before Gogeta can finish him off.

Cheelai and Lemo settle down with the reverted Broly but are visited by Goku, who brings the group supplies and offers to teach Broly how to control his power, befriending him and sparking a friendly rivalry between them.