"I killed a man named 'Smith' with a bottle because I am an evil human being. ...Isn't that enough?"The Ace Attorney franchise has produced its fair share of monstrous villains.
—The real killer, Apollo Justice: Ace Attorney, Episode 4: "Turnabout Succession"
Phoenix Wright: Ace Attorney
- Redd White from Phoenix Wright: Ace Attorney is the amoral CEO of Bluecorp, a business that profits off of obtaining incriminating information and blackmail. In the past, Redd White leaked information about Misty Fey's involvement with the police investigation of Gregory Edgeworth's murder, which resulted in the Fey clan of spirit medium's name being soiled. In the present day he has kept numerous influential people under his thumb such as Marvin Grossberg, forcing them to cater to his whims on threat of leaking their deepest secrets to the public, which would ruin their lives. He has driven numerous people to suicide as a result, and doesn't care in the slightest while fully intending to continue his blackmailing operations. When Mia Fey was preparing to bring evidence of his culpability in the suicides to the public, he stole the information she had and beat her to death before trying to pin the blame on her younger sister Maya. When Phoenix Wright uncovers the truth, Redd throws him under the bus instead, fully intent on using his connections in the legal world to crush him in court.
- Manfred von Karma is the Big Bad of Phoenix Wright: Ace Attorney. As a prosecutor, he had a flawless, decades-long win streak, until defense attorney Gregory Edgeworth managed to have him penalized for his illegal workings in the courtroom, causing von Karma to become enraged by the black mark on his previously-perfect record. Right after the end of the case, Gregory Edgeworth, his nine-year-old son Miles, and a bailiff become trapped inside an elevator. When the bailiff panicked and attacked Gregory, Miles tried to stop the fight by throwing a piece of evidence which turned out to be a gun. The gun fired and hit Von Karma, who came upon them, in his shoulder. For revenge, von Karma picked up the gun and shot the unconscious Gregory in the heart. Afterwards, von Karma took Miles under his wing and, for fifteen years, raised Miles to be the antithesis of everything that Gregory Edgeworth was, twisting the boy to fit his views and become a ruthless, cold-hearted prosecutor who cared for nothing but getting a guilty verdict every time. Finally, on the very last day before the Gregory Edgeworth murder case was closed forever, von Karma set up a murder and pinned the blame on Miles Edgeworth, intending to have his own foster-son executed for a murder he didn't commit. Von Karma also planned it out so that Miles would be convinced that he himself was the one who had killed his father and would confess to and be charged with that murder as well.
- Matt Engarde from the Phoenix Wright: Ace Attorney: Justice for All case "Farewell, My Turnabout" threw away his loving and devoted manager Celeste Inpax once he was done using her to further his career. When Celeste was engaged to his rival, Engarde told him Celeste was "used goods" to trick him into calling off the wedding. Celeste killed herself, to Engarde's delight. Engarde later hired professional assassin Shelley de Killer to murder his rival, but kept blackmail material to betray de Killer as well. To force Phoenix Wright to acquit him for murder, Engarde had de Killer kidnap the innocent Maya Fey and attempted to pin his crimes on the innocent, miserable and insecure Adrian Andrews partly for the thrill of hurting her.
- Dahlia Hawthorne, the Big Bad of Phoenix Wright: Ace Attorney: Trials and Tribulations, previously manipulated her boyfriend into assisting her in a crime, before framing him for murder and ensuring his suicide to cover her tracks. She later poisoned the lover of the prosecutor Mia Fey when he got too close to her crimes, before she seduced Phoenix Wright as well. When her twin sister Iris fell for Phoenix, Dahlia accelerated her plans to poison him. When an ex-lover of hers tried to warn Phoenix, Dahlia murdered him and tried to frame Phoenix. Despite being executed, Dahlia returned as a vengeful ghost, aiding her mother to kill Dahlia's cousin Maya Fey solely to spite her elder sister Mia's spirit. Taking steps to manipulate her twin again to help with the murder, she came back from the dead to possess Misty Fey—albeit due to Misty's desire to protect her niece Pearl—and attempted to murder Maya, being stopped only by the intervention of Godot who killed her host. But despite this she became convinced that she had forced Maya to murder her own mother and caused her to commit suicide, which she gloated over to their faces. She's also a giant hypocrite, as she shows nothing but disgust towards Morgan Fey because of the "petty revenge" that she was after, but at the same time was going along with Morgan's plan specifically in order to get her own revenge on Mia.
- Kristoph Gavin is introduced as a supposedly helpful mentor. He is also the first man responsible for ushering in "The Dark Age Of The Law" by getting Phoenix Wright disbarred. Kristoph ended up taking a massive blow to his ego when a magician and prospective client, Zak, rejected Kristoph as his lawyer. When Zak hired Phoenix instead of him due to a poker game, a furious Kristoph decided to get revenge. He had gotten a shy artist named Vera to unknowingly create fake evidence for the trial, but after Phoenix was hired, Kristoph used the evidence to get him disbarred. Kristoph also manipulated his own brother, prosecutor Klavier, by using him to disbar Phoenix and cheating the honorable Klavier out of a fair trial. Klavier, who knew something wasn't right, was haunted for years. When Zak resurfaced under a new identity years later, Kristoph took the chance to murder him and frame Phoenix. After this, it was revealed Kristoph had poisoned Vera and her father Drew, intending both to die. Vera survived, barely. To pour salt on the wound, Kristoph gloated how Apollo and Phoenix had triggered his plan-their questioning caused Vera to bite her nails- when he had planted the poison as nail polish, knowing her nervous habit. He had even started poisoning her when she was only twelve. After her survival, Kristoph simply enjoyed seeing Vera face conviction for her own father's murder. In the end, he was little but a cruel, petty, selfish man obsessed with glory and destroying those who stood in his way.
- While initially seeming like a frail and kind individual, Big Bad Quercus Alba turns out to be the hardened, cold-hearted boss of a large and powerful smuggling ring. Thanks to him putting many highly-convincing counterfeit bills into circulation, the country of Zheng Fa has been thrown into economic chaos due to his machinations. He also ordered the deaths of Cece Yew, Deid Mann, and Byrne Faraday due to their efforts in trying to expose his role in the smuggling ring, and personally murdered Mask*DeMasque II and his subordinate Manny Coachen: DeMasque II for stealing the fake statue that contained the plates used for creating counterfeit bills, and Coachen due to him seeking to steal power of the smuggling ring from under Alba's nose. Ruthless and rotten to the core, Alba will kill anyone without so much as a second thought for the sake of keeping his criminal empire running.
- The internationally-hired mercenary spy known only as the phantom is a nasty piece of work, and is the second figure, after Kristoph Gavin, who ushered in "The Dark Age Of The Law." His plan begins when he murders the cheerful Bobby Fulbright to assume his identity and become Simon Blackquill's handler. Before that, he killed Athena Cykes's mother and pretended to be her, and using a Noh mask hanging from her wall, as well as her jacket, he fooled the helper robots into thinking Athena—then an 11-year-old child—had killed and disassembled her mother. By doing so, he gets the noble Prosecutor Blackquill convicted and proceeds to sabotage the HAT-1 rocket, causing the astronaut to barely escape with his life. After that was all done, some 7 years later, he sent a warning to the director Yuri Cosmos, and when that was ignored, bombed the space station. Afterwards he killed Apollo's best friend, Clay Terran, who tried to fight back, and threatened to expose his identity, framed the other astronaut and big brother figure to Apollo and Clay for the crime, and when that failed, bombed the courtroom to destroy a piece of evidence, nearly causing the deaths of hundreds, then framing Athena for this. He was also able to frame Athena's best friend, Juniper Woods, for the courtroom bombing. Had it not been for Athena's moon rock earring being able to be compared with the destroyed moon rock, he would have gotten away with everything. Be that as it may, he also doesn't feel emotions the way a normal person does, and as such, is a chillingly realistic example of a sociopath in a video game.