Even the most ruthless anime villains can have a change of heart. For example, Dragon Ball's Vegeta and Piccolo are two of the most popular villains turned heroes, from fighting on the side of evil to joining the good protectors of Earth. It may not seem possible at first, but a single life-changing experience can push even the most powerful villains onto a better path.

7 Overpowered Anime Characters That Would Lose To Vegeta
Vegeta is known as one of the strongest characters in Shonen anime history, and here are some of the strongest characters he would defeat.
That said, Vegeta and Piccolo aren't the only villains who switched to good in the anime. These powerful anime villains initially antagonized the main characters of their respective series and did everything they could to stand in the way of their goals before ultimately redeeming themselves.
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9
Franky became the Straw Hats' super shipwright in one piece
Accompanying the Straw Hat Pirates on their adventure is one of the most difficult yet rewarding decisions Franky made in One Piece. He started out as a thief, stealing the 200 million hard-earned berries from the Straw Hat crew to fund the expensive materials for his dream ship. He never imagined that he would end up joining Luffy's crew at all.
Now Franky works as the straw hat's repairman, tasked with taking care of the thousand sunnies to the best of his ability. Of course, he doesn't ignore his personal upgrades, making him one of the strongest members of the crew, despite not being on the same level as the main trio of Luffy, Zoro, and Sanji.
8
Toichiro Suzuki found purpose beyond power in Mob Psycho 100
Toichiro's bold ambition i Mob Psycho 100 driving him to antagonize Shigeo Kageyama with his monstrous psychic abilities. He wanted to rule the world and, in preparation, began to store as much psychic energy as possible. With his ability to absorb psychic energy from other espers, achieving his lifelong dream was not out of reach until his explosive confrontation with Mob changed him.
Toichiro became remorseful and realized that his ambition and overwhelming abilities had led him down the wrong path. To redeem himself he joined a group of espers trying to stop the Mobs ??? % form. Although he failed to stop the advance, his willingness to fight it showed that he had begun to understand right from wrong and had grown into a better person.
7
Evil Eye became Momo and Okarun's battle-driven ally in DanDaDan
Evil Eye cornered Momo and Okarun with his absurdly powerful yokai abilities Dan Da Dan. With Evil Eye in control of Jiji, he transformed accumulated hatred into a deadly ball of energy capable of annihilating anything it touched. That's not all, as his physical attributes, especially his durability, make him difficult to take down.
Thankfully, Evil Eye reached an agreement with Okarun, promising to cooperate as long as he could still enjoy intense battles in the series. He may not be the nicest semi-ally that Momo and Okarun have, but he remains a reliable force on the battlefield as long as he's in the perfect mood to fight.
6
Gajeel Redfox got his place in Fairy Tail
Before Gajeel Redfox swore allegiance to the Fairy Tail Guild, he led the awkward assault against them as a Phantom Lord Guild member. His goal was to prove the Phantom Lord's superiority by bringing down Fairy Tail without fail. During the conflict, he even clashed with Natsu Dragneel and at one point forcibly captured Lucy Heartfilia to further his guild's agenda.
Today, Gajeel proudly fights as part of Fairy Tail, using his Iron Dragon Slayer abilities to overwhelm opponents. He can arm his own body and unleash crushing metal-based attacks. With his brutal fighting style and terrifying aura, he is a warrior that few would ever challenge easily.
5
Beru joined Sung Jinwoo's Shadow Army in Solo Leveling
Beru, the shadow of Jeju Island's Ant King, went on a terrifying killing spree in Solo Leveling Season 2 before he joins Jinwoo's elite soldiers. He aimed to become the king of the world by defeating its current king, forcing him to punish the S-level hunters who roamed his home island. He annihilated almost all the hunters involved in the raid on Jeju Island and broke through them one by one.
But losing to Jinwoo means giving up one's identity and personal ambition. What he got is limitless evolution, in addition to having the privilege of serving the Shadow Monarch forever. From being a power-hungry ant king, Beru became a trusted ally in Jinwoo's shadow army, someone who can lead raids on his own and even stand up to higher beings with god-level powers.
4
Sasuke Uchiha became Konoha's Shadow Hokage in Naruto
Sasuke Uchiha went through many difficult challenges in Naruto, which strongly influenced his actions and decisions. He went from being a hero to a villain before finally redeeming himself and becoming a hero again. Fortunately, Sasuke's days of shifting loyalties are over, as he has fully embraced his role as Konoha's Shadow Hokage.
At the moment, Sasuke Uchiha is much stronger than Naruto Uzumaki. Despite losing his Rinnegan, he still has the Eternal Mangekyo Sharingan in his possession, in addition to the power-ups he received before and after becoming a template for Shinju Hidari in Boruto: Two Blue Vortex.
3
Accelerator became a reluctant savior in the Toaru Franchise
The Toaru franchise has an incredibly strong antagonist who can vector control in Accelerator. This unique ability allows him to easily deflect or redirect incoming attacks before they can touch him, proving that he is worthy of being called Academy City's most powerful esper. Despite frying his brain through excessive use of his abilities, Accelerator remains one of anime's most immovable characters that only a select few can overcome.
Accelerator's defeat at the hands of Kamijou Touma became the catalyst for his massive transformation. He went from mercilessly slaughtering thousands of Misaka sisters without remorse to risking his own life to protect the Last Order, making his redemption story one of the most well-written.
2
Piccolo became one of Earth's most selfless heroes in Dragon Ball
Thanks to Gohan, Piccolo abandoned his evil ways Dragon Ball. Instead of continuing King Piccolo's feud with Goku, Piccolo abandoned his villainous ways after he unexpectedly warmed to Gohan. Even laying down his life for Gohan became second nature to Piccolo, proving how much he had changed.
Although Piccolo is not the strongest fighter in the series, the Super Hero Arc finally gave him the rare chance to be on par with the Saiyans with his latest god-level transformation. Orange Piccolo is unlike anything fans have ever seen before, finally elevating the beloved Namekian to a whole new level of power.
1
Vegeta transformed from fighter to defender in Dragon Ball
Softening Vegeta's cold heart isn't easy, but Bulma, Goku, and the rest of Earth's strongest protectors eventually did the job. His transformation from villain to ally didn't happen overnight, as it took a number Dragon Ball episode before Vegeta fully embraced life on Earth and his new family.
Vegeta stands as one of the most powerful Dragon Ball characters ever, strong enough to rival Goku and stand against the strongest villains from different races and universes. It's difficult to gauge Vegeta's full potential, as the Prince of Saiyans knows no end to his relentless pursuit of power.