Gregory Grape

Sociopathy
The word element socio- has been commonly used in compound words since around 1880. The term sociopathy may have been first introduced in 1909 in Germany by biological psychiatrist Karl Birnbaum and in 1930 in the US by educational psychologist George E. Partridge, as an alternative to the concept of psychopathy. It was used to indicate that the defining feature is violation of social norms, or antisocial behavior, and has often also been associated with postulating social as well as biological causation.

The term is used in various different ways in contemporary usage. Robert Hare stated in the popular science book entitled Snakes in Suits that sociopathy and psychopathy are often used interchangeably, but in some cases the term sociopathy is preferred because it is less likely than is psychopathy to be confused with psychosis, whereas in other cases the two terms may be used with different meanings that reflect the user's views on the origins and determinants of the disorder. Hare contended that the term sociopathy is preferred by those that see the causes as due to social factors and early environment, and the term psychopathy preferred by those who believe that there are psychological, biological, and genetic factors involved in addition to environmental factors.[81] Hare also provides his own definitions: he describes psychopathy as not having a sense of empathy or morality, but sociopathy as only differing in sense of right and wrong from the average person.

Callous and unemotional traits (CU)
Callous and unemotional traits (CU) are distinguished by a persistent pattern of behavior that reflects a disregard for others, and also a lack of empathy and generally deficient affect. The interplay between genetic and environmental risk factors may play a role in the expression of these traits as a conduct disorder (CD). A CU specifier has been included as a feature of conduct disorder in the fifth revision of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5).

Tohru Adachi
Tohru Adachi is the main antagonist in the video game Persona 4 and one of the puppets of Izanami. A police detective who keeps up the appearance of being incompetent and friendly, he is in reality the culprit behind the murders plaguing Inaba, has almost no regard for human life and will go to any lengths simply to amuse himself. In Persona 4 Arena: Ultimax, he returns as an anti-hero.

Adachi is a young police officer in the Inaba police department, and Ryotaro Dojima's junior partner. He often accidentally reveals crucial information regarding the investigation to the protagonist, and is constantly reprimanded by Dojima for running his mouth.Following the revelation that Taro Namatame is not the culprit behind the murders, it is revealed that Adachi is actually behind the two first murders. He became interested in Mayumi Yamano and Saki Konishi until he pushed them into TVs when they spurned his feelings. After the two initial murders, he tricked Namatame into kidnapping people under the idea that he was keeping them from danger, which is reinforced as every person Namatame "rescues" is then saved by the protagonist's group.

Adachi explains that his reason for his actions is nothing more than to entertain himself and out of disgust for the human world. Adachi uses his handgun in battle. His Persona is Magatsu Izanagi (マガツイザナギ, lit. "Corrupted Izanagi"), which resembles the protagonist's initial Persona. He is defeated by the party and arrested for his crimes. If the player continues towards the True Ending, the protagonist receives a letter from a recently convicted Adachi, stating his suspicions of a true conductor behind all of the events of the case, providing the investigation team with new insight to their reasoning. It is then revealed he gained his power from Izanami like Yu and Namatame. During the epilogue, Adachi's trial has yet to start but he still gets in contact with Dojima in his cell.

In Persona 4 Golden, Adachi is added as one of the new Social Links the player can build, initially represented by The Jester (道化師 Dōkeshi, "The Pierrot" in Japan); at the game's climax, the player has the option of pursuing Adachi as the main culprit, which changes the Social Link name to The Hunger, or in the Japanese version The Lust (欲望 Yokubō) of the Thoth Tarot, or the player can assist Adachi in destroying evidence and allowing him to escape, resulting in the new "Accomplice" ending.

Adachi makes a non-playable appearance in arcade version of Persona 4 Arena Ultimax and becomes playable in the console version with a DLC. During a routine questioning, Sho possesses the detective in charge of Adachi's investigation and uses him to rescue Adachi from prison, throwing him back into the TV world to help him destroy the world by collecting persona fragments and using them to release Hino-Kagutsuchi, a malevolent and powerful avatar of death. He ends up in a Tartarus-esque version of Yasogami High School, meets Yu and company, and pays lip-service to Sho while secretly working to stop his plan.

Adachi eventually makes his move to destroy the crystallized Persona fragment that Sho had captured. He manages to crack the crystal, but is severely beaten by Sho after the latter uses his borrowed power to within an inch of his life until Yu intervenes. Despite being former enemies, Adachi and Yu team up to defeat Sho and Hino-Kagutsuchi, and with the world saved, Adachi returns to his cell and is peacefully visited by his old friend, Ryotaro Dojima.

He is voiced by Mitsuaki Madono in the Japanese version and Johnny Yong Bosch in the English version.