His last words before his death revealed the existence of the greatest treasure in the world, One Piece. The capture and death of Roger by the World Government brought a change throughout the world. Roger was known as the Pirate King, the strongest and most infamous being to have sailed the Grand Line. Ryu (Street Fighter franchise) - Under enough anger and stress, Ryu can become corrupted by the Satsui no Hadou to become an evil version of himself called Evil Ryu, where he becomes greatly stronger at the cost of his sanity and self-control. Agumon and Guilmon (Digimon) - Both Digimon fell victim to Dark Digivolution where the negative emotions of their human partners caused them to evolve into corrupted forms who attacked both friend and foe alike, with Agumon becoming Skullgreymon and Guilmon becoming Megidramon.
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The form can only be sustained for a short time as it puts a great mental strain on any Newtype pilot piloting it. takes over control of the mech as it gains a significant boost in capabilities and will mercilessly go after any Newtype-piloted mech, regardless if it's ally or foe. Unicorn Gundam (Gundam Unicorn) - The titular Gundam has an alternate mode called Newtype Destroyer Mode that activates whenever it encounters a mech piloted by a Newtype. This results in Goku becoming significantly more powerful than in his sealed form, yet going into a bloodlusted frenzy where he'll attack both ally and foe. Son Goku (Saiyuki) - If the diadem on Goku's head is removed, his evil side of the Seiten Taisei manifests. This causes them to blindly attack anyone regardless if they are ally or foe. Any Nodos (Heroic Age) - Humans with the power to become a Nodos can enter a berserker state called Mental Chaos if they encounter one another. However due to his unstable state, he loses accuracy and control over his powers. Kazuma Yagami (Kaze no Stigma) - If angered enough, Kazuma enters into a psychotic state where the wind he controls turns black and he gains telepathic powers. Yami Bakura is the evil spirit within the Millennium Ring that often possesses Bakura in his own plans to collect the other Millennium items.
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He's a sadistic psychopath who relishes in torturing his foes through Dark/ Shadow Games.
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Yami Marik and Yami Bakura (Yu-gi-oh) - Yami Marik is a split personality that manifested in Marik due to the abuse he took from his father in being a Gravekeeper.