Cranky Kong (Donkey Kong Series)
It's been a long time since Donkey Kong was Mario's barrel-throwing enemy. He's now grown into Cranky Kong, however, and he's simply around to advise DK and raise him right.
Captain Qwark (Ratchet and Clank Series)
In the first two R&C games, Qwark wasn't at his best. He teamed up with Drek in the first game and was the main villain in the second. By the third game, he proved he was a hero after all (though an arrogant one), and since then, he's been a good guy.
Knuckles (Sonic the Hedgehog Series)
Knuckles the Echidna is a fictional character in Sega's Sonic the Hedgehog series. He is a red anthropomorphic echidna who is determined and serious, but sometimes gullible. He has the ability to glide and climb up walls, and is a powerful fighter due to his spiked hands. He was tricked into being Sonic and Tails' enemy in Sonic 3, but by the end, he teamed up with them. Now it's kinda weird seeing him evil back then.
King Dedede (Kirby Series)
King Dedede is a fictional character and the primary antagonist of the Kirby series of video games owned by Nintendo and HAL Laboratory. Like Meta Knight, he was only evil for a short time. He tried to stop Kirby from unleashing Nightmare in Adventure. Since Super Star, he's been good. All the fights since then (except for the fight in Mass Attack, which was weird to begin with) were either started by Kirby or had the King being possessed by some embodiment of evil.
Dedede used to be the main villain in Kirby games, but he ended up teaming with the pink marshmallow in Kirby 64. Since then, he hasn't done much villainous. He even helps you in Kirby Return to Dreamland and Triple Deluxe.
Bowser (Mario Series)
Bowser is the main antagonist of the Mario Bros. Franchise. From kidnapping Princess Peach to simply destroying a fun game between Mario and Friends in the Mario Party spinoff series, this king of the Koopas has set up a certain hatred towards himself amongst the large cast of Mario Characters. He first... read more Eh, I wouldn't say he's good. I mean, in Galaxy, he tries to take over the universe. However, he has his moments.
He hasn't gone totally good, but he has gotten less evil through the years.
Meta Knight (Kirby Series)
Meta Knight is a fictional character from the Kirby series of video games owned by Nintendo and HAL Laboratory. He is one of Kirby's rivals, but occasionally teams up with the pink puffball to defeat a common enemy. Meta Knight is known for his powerful slashing attacks and flight in the Super Smash... read more He was never really evil. In Adventure, he basically dueled Kirby to prepare him for the final fight against Nightmare. Meta Knight knows what Kirby is going to do and prepares him for the challenge ahead. He was only really evil for one subgame in Super Star (even then, he just wanted everyone to be more active).
Another Kirby character. Meta Knight started as a nameless villain in Kirby's Adventure, became a main antagonist in Kirby Super Star, and after that, I guess he gave up.
Balrog (Cave Story)
The Amalgamates (Undertale)
Miles Edgeworth (Ace Attorney)
Globulous Maximus (SpongeBob SquarePants Featuring Nicktoons Globs of Doom)
Globulous Maximus is the main antagonist in Globs of Doom, but he was born a giant booger.
The Newcomers
? King Olly (Paper Mario: The Origami King)
The reason he turned good is because Spoiler Warning he not only apologizes for his actions after being defeated but also willingly sacrifices himself to undo his mess.
? Michael Afton (Five Nights At Freddy's)
Michael Afton (also nicknamed as "Eggs Benedict" by the HandUnit) is the main protagonist of Five Nights at Freddy's: Sister Location. He is the son of William Afton, and brother of the deceased Elizabeth Afton.
The Contenders
Dimitri Lousteau (Sly Cooper Series)
THANK YOU FOR ADDING THIS! I swear, I could never remember his name!
Asriel (Undertale)
The most dreadful, merciless flower in history to a lonely, crying kid? Touching.
Arbiter
In the Halo science fiction universe, the Arbiter is a ceremonial, religious, and political rank bestowed upon alien Covenant Elites.
Giovanni (Pokemon FireRed and LeafGreen)
Captain Hook (Disney Infinity)
Master Hand (Super Smash Bros. Series)
In Super Smash Bros. Brawl, he died saving his brother.
Gru (Despicable Me Series)
Felonius Gru is the main character of Despicable Me, Despicable Me 2, and Despicable Me 3, alongside Mel and a minor character in Minions.
Egil (Xenoblade Chronicles)
Asgore (Undertale)
Asgore Dreemurr is a boss monster and the king of the monsters in the 2015 RPG Undertale made by Toby Fox. Asgore is the portrayed main antagonist who plans to acquire seven human souls and use their power to break the barrier that seals the monsters underground . Aspects of his character are hinted... read more
Handsome Jack (Tales from the Borderlands)
Handsome Jack is the main antagonist of both Borderlands 2 and Tales from the Borderlands and the deuteragonist of Borderlands: The Pre-Sequel.
Magolor (Kirby Series)
Magolor is a fictional character from the Kirby series of video games owned by Nintendo and HAL Laboratory. Magolor Epilogue is the ultimate redemption story. Magolor betrayed Kirby and stole the Master Crown. He tried to take over existence, but he lost. After defeat, the crown took over and devoured Magolor's soul, turning him into a "sad shell."
Already he's remorseful. He gets killed and then banished to another dimension. However, the Master Crown breaks off his head, freeing him from its control (and he loses most of his powers).
All this means that Magolor effectively gets a second chance, one that he doesn't waste. He recovers his powers attempting to get home and apologize to Kirby for what he's done. Before he can, though, the crown returns and destroys the dimension. Magolor then uses his full, regained might to destroy the evil artifact once and for all.
And guess what? He does it, redeeming himself in the process. He's helped Kirby in every game since.
Moto Moto (Madagascar)
Darth Vader (Lego Star Wars)
Darth Vader is a Star Wars character and the main antagonist of the first three original Star Wars films and the main protagonist of the Star Wars prequel trilogy under his original name Anakin Skywalker. He had been trained as a Jedi but defected to the Sith lord and Galactic Chancellor Palpatine... read more
Papyrus (Undertale)
Papyrus is a character from the 2015 game Undertale, made by Toby Fox. He is the Younger brother of Sans the skeleton, royal guard in training, and a sentry in the town of Snowdin. Opposite to his brother, papyrus is active, loud, and full of himself; but in an endearing way. Papyrus means to become... read more
Ganondorf (The Legend of Zelda)
Ganon (Referred to as Ganondorf in human form) is a fictional character and the central antagonist of Nintendo's Legend of Zelda series. He is a power-hungry Gerudo who possesses the Triforce of Power and aims to conquer Hyrule with the remaining Triforce parts. Ganondorf was never really the bad guy. He holds the Triforce of Power, so he's technically a hero. He tries to save his people (Ocarina of Time), end a war (Hyrule Warriors), and turn Bowser back to normal (Super Smash Bros. Melee) - all by himself!
He tried to restore Hyrule in Wind Waker. Enough said.