Nick Valentine

Status: Memory Erased 
“I'm a synth. Synthetic man. All the parts, minus a few red blood cells.” — Nick Valentine, regarding his synthetic body
Nick Valentine is a synthetic private detective and a potential companion of the Sole Survivor living in Diamond City in 2287.
Background An unusual robotic detective, Nick Valentine is the sole detective of a small agency he runs in Diamond City alongside his assistant Ellie Perkins. In addition to possessing the memories of a late pre-War detective, Nick has certain abilities that complement his investigative skills: he is very effective at hacking computers, and adept at both ranged and melee combat. Valentine believes himself to be a prototype between second-generation synths and the latest, which might explain why he exhibits sapient intelligence and is not innately hostile towards non-Institute humans. He is generally well respected throughout Diamond City despite his mysterious origins.
Originally, along with another synth named DiMA, the synth that would become Nick Valentine was one of two unique prototype Gen 2 synths used to test if and how synths could handle independent thinking. For years he was experimented on, having various personalities and memories from former humans loaded into him. Despite this, he and DiMA grew a family-like bond to one another, due to being the first and only synths of their kind. This was until DiMA, having been an experiment on a synth developing its own sense of consciousness and self without preloaded personalities or memories, grew to resent the experiments being performed on him and his "brother." The two synths managed to escape, but not before the Institute uploaded a new personality and memories in DiMA's brother. The synth, now identifying himself as a pre-War police officer named Nick Valentine, in a state of confusion due to suddenly "waking up" 200 years in the future, attacked DiMA, who was left with no choice but to knock Nick out and leave him behind. After regaining consciousness in a pile of garbage an unknown amount of time later, Nick wandered the wasteland in a state of confusion for several weeks.
Due to unfamiliarity with the Institute and its technology, most wastelanders regarded Nick with equal parts fear and awe; however, he was eventually accepted into a small local community where a mechanic offered to repair the damage he had sustained in his travels. During this time Nick befriended a child he knew only as Jim, the first human contact Nick ever had. The community was the first time since his reawakening that anyone had treated Nick as a human being and not some mechanical monstrosity. Nick eventually left that settlement; upon visiting years later, he found that it had been pillaged by raiders.
Nick eventually found himself traveling to Diamond City. Although Diamond City holds no small amount of hatred for the Institute and their synths, Nick gained their respect by saving the daughter of the city's former mayor, Henry Roberts, when she ran away with a caravan trader. The caravan trader and his companions were, unbeknownst to the girl, actually kidnappers who proceeded to take her hostage. Nick stumbled upon the kidnappers purely by accident when he was wandering the Commonwealth wasteland, having been almost exclusively itinerant since his "awakening." Finding himself held at gunpoint and likely the girl's only hope, Nick scared the abductors away by claiming that he had a bomb inside him and beeping (Nick claims that he literally just said the word "beep" repeatedly).
When the mayor's daughter told Nick what had happened, he returned her to her father, who in turn gave him a house in Diamond City as compensation, despite the citizens' dismay and objections. Nick gradually eased the citizens' fears by acting as Diamond City's handyman. His formidable detective skills were brought to the forefront when he helped to find a wife who was presumed dead; Nick discovered that she had only run away with her lover. In time, people stopped asking Nick to fix things, as it became clear that he had found his true calling as Diamond City's private investigator. While on a case to find a woman named Darla, who was believed to have been kidnapped but in fact had run away to join the gang of mobster Skinny Malone, Nick was captured and imprisoned within Malone's hideout in Vault 114. It was here that he met and was rescued by the Sole Survivor. The two escaped the vault after a confrontation with Skinny Malone and Darla. Upon their escape the pair met up at Nick's office, where the Sole Survivor enlisted his help in tracking down their missing son.
Nick eventually opens up to the Sole Survivor and starts the quest Long Time Coming. Nick asks them to help him tie up the last "loose end" of the original Nick Valentine's life: bringing down his old rival Eddie Winter. After tracking down all 10 of Winter's old holotapes, Nick and the Sole Survivor use them to decode Winter's hideout and the code to get in. Once inside, Nick confronts a ghoulified Winter (who does not recognize Nick due to his synthetic nature). Together, with or without the Sole Survivor's intervention, Nick kills Winter and avenges the murder of the original Nick's fiancée, Jennifer Lands. Nick then shows the Sole Survivor the site where Winter had killed Jennifer, before contemplating who he is and what purpose his life has after that point.
While traveling with the Sole Survivor, Nick finds himself on a case to find the missing daughter of Kenji Nakano, who apparently worked with Nick on a prior case that wound up with Kenji getting shot in the hip. The trail leads to Far Harbor. While on the island, Nick is reunited with DiMA, who is now the current leader of Acadia. Though DiMA is very glad to see his brother again, Nick is reluctant due to not remembering DiMA at all. Upon finding proof of their relationship, the Sole Survivor can convince Nick to accept DiMA as his brother, and the two will occasionally greet each other or chat upon entering Acadia.
The original Nick Valentine The original Nick Valentine was a police detective from Chicago. He was brought to Boston to lead "Operation Winter's End," an operation to bring down mob boss Eddie Winter. Unfortunately, Winter or one of his associates managed to find out about Nick's fiancée, Jennifer Lands and killed her in revenge for Nick's involvement in the operation.
The Bureau of Alcohol, Drugs, Tobacco, Firearms and Lasers, otherwise known as BADTFL, received intelligence of associates of Winter discussing her whereabouts, but senior officers decided not to place Jennifer or Nick into witness protection in order to avoid compromising the investigation. To make matters worse, Nick and the rest of the task force on Operation Winter's End discovered that Winter made a deal with the BADTFL and the district attorney to incriminate his associates in exchange for immunity.
In the weeks preceding the fall of the bombs, Winter was released and Operation Winter's End was disbanded. Nick was ordered to seek treatment for PTSD at the Commonwealth Institute of Technology, where his brain was scanned as part of his treatment. This was how the Institute was able to obtain Nick's pre-War memories and implant them within a synthetic body.