Mio Takamiya[]
Westcott created Mio through the Spirit Formula in order to use her power to realize his dream of a paradise for Magicians. Noticeably, Westcott has shown quite a degree of possessiveness towards Mio, laughing insanely whenever her name or presence is sensed and calling her his most "beloved Spirit". This hasn't gone unnoticed by Mio, who speculates that never being able to win her affection may have been another cause of his suffering. Even in his final moments, Westcott joked with Woodman about how they were both rejected by Mio.
Nibelcole[]
Westcott created the Nibelcole using <Beelzebub> and appears to be rather proud of his creations. However, like with most of DEM's personnel, he seems to view them as little more than disposable foot soldiers. On the other hand, unlike Ellen, Westcott does not seem to be bothered by them acting like teenage girls.
Ellen Mira Mathers[]
As the leader of DEM, Ellen is his top subordinate. He frequently sends her out on missions to capture Spirits, which he trusts in her that she can accomplish despite the danger. Ellen herself is completely loyal to Westcott and his goals, though she does get annoyed at him sometimes for his laid-back attitude towards urgent matters. Despite this loyalty, Westcott willingly sent out Ellen into a mission to capture <Zodiac> while he personally led the raid on the <Ratatoskr> base, knowing full well that Ellen would become very frustrated if she ever found out about being left behind. Ellen would lose her memories of Westcott after his death, which is postulated to have been set up by Westcott himself in a rare act of kindness so she would not mourn him.
DEM's Board of Directors[]
As a result of his lack of care for his organization, Westcott is very unpopular among the members of his board of directors. Most of them want to remove him as director for placing his own selfish desires above the image of the company.
However, after Roger Murdoch attempted to remove Westcott from the post of director of the DEM, he and the other members who voted to remove him had their arms cut off by Ellen. After his true identity was discovered, he was described as a "monster" by his own company. In turn, Murdoch went so far as to send down three satellites in order to kill Westcott.
Westcott is fully aware of this, however, he doesn't care about it because he knows that they can't do much about him without getting through Ellen or the immense influential power that he holds. Westcott even seems to enjoy seeing the board trying to get rid of him, and he praises Murdoch for going to such extremes in his attempt.
Elliot Baldwin Woodman[]
Westcott and Woodman are childhood friends, having worked together with him and Ellen to create the Spirit Formula that gave birth to the concept of Spirits. However, at some point, Woodman left Westcott and Ellen and formed Ratatoskr. Westcott holds a great hatred for Ratatoskr, considering it an organization of "greenhorns" and its goal "something that can only be said out randomly while drinking a cup of sake".
Despite his contempt for Elliot's organization, Westcott maintains a far more cordial relationship with its founder compared to Ellen. When Westcott took control of the body of James A. Paddington and used it to talk to Woodman, he acted rather friendly to Woodman and even asked him to come back to his side. However, Woodman denied his offer. In response to this, Westcott told Woodman that even so, he cannot stop him from achieving his goal. However, Woodman told Westcott that Ratatoskr will stop him, and that, that is the true reason why he formed the organization.
Later, he uses <Beelzebub> to locate and invade Ratatoskr's HQ so he can confront Elliot and attempt to bring him back to DEM. This eventually leads to a confrontation with his old friend that ends in a stalemate, with both of them losing an arm in the exchange. As Westcott lies dying from his final clash with Mio, Woodman stays with him to watch his final moments, with even Westcott laughing at how they were comrades from being rejected by the same woman.
Mana Takamiya[]
Because she thought that they gave her a home, Mana was once one of DEM's (and by extension Westcott's) most loyal subordinates. Westcott acknowledged her abilities and gave her the title of Adeptus 2.
However, after Mana was rescued by Ratatoskr and was told that DEM experimented on her body, increasing her fighting ability but shortening her lifespan to just ten years, she defected to Ratatoskr. Westcott didn't care about Mana's defection until he realized that he had lost her fighting ability. Then, he simply thought about bringing Origami Tobiichi into DEM to replace her.
Much later, it is revealed that Westcott in fact kidnapped Mana from her family, trying to use her bartering chip to trade for Mio. After learning her name was Mana, Westcott laughed at the sheer coincidence of the name, as the Spirit of Origin was created from gathering the world's mana.
Origami Tobiichi[]
Old Timeline[]
Westcott seems to be interested in gathering powerful Wizards for DEM, and after he heard of a Wizard named Origami Tobiichi, who had managed to use the <White Licorice> without undergoing DEM's enhancement treatment, she immediately caught his eye.
Their first meeting was when Origami was about to be discharged from the AST for stealing the <White Licorice>. Westcott came in and used his influence as director of the only organization that could make Realizers to force the leaders of the Japanese military to shorten her punishment to 3 months of house arrest. However, Origami herself actually seemed unhappy about it and thought of Westcott as simply a "creepy man".
After that Origami has fought against DEM (and by extension Westcott) several times.
After Jessica Bayley was killed and Mana Takamiya defected from DEM, Westcott thought of bringing Origami into DEM to replace both of them. He succeeded by offering to give her the power to defeat the Spirits and information about the Spirit that killed her parents. However, Origami disobeyed Westcott's orders several times, attacking when she was told to remain on standby and trying to kill the Spirits when she was only told to capture them. After Origami was turned into a Spirit by <Phantom>, her affiliation with DEM came to an end, Westcott tried to act as if he was sad that he lost such a talented Wizard, but couldn't hide his pleasure about that Origami had become a Spirit.
New Timeline[]
In the new timeline, Westcott and Origami had never met face to face. However, Westcott was aware of Origami's existence as the Spirit <Devil>. After Shido managed to save Origami and she was taken into the Ratatoskr, Westcott considered it a great loss for him. The reason for this is because Origami always appears in her Inverse Form, and a Spirit can only go Inverse "When pushed into the deepest abyss of despair". Westcott also ended up taking an interest in what made her go Inverse in the first place.
However, at the end of Nia Creation, when Wescott tested <Beelzebub>, he found out about the old timeline and his past relationship with Origami.
Nia Honjo[]
Nia was DEM's first captive Spirit. He labeled her "Material A" and spoke of her as his possession. He put her through cruel experiments and torture in an attempt to make her fall into despair and Inverse, but she instead approached a catatonic state. Seeing as Nia had already closed her heart from an inability to trust people, he implanted a Realizer in her brain to suppress the memories of her captivity. He predicted that releasing her would lead to Shido opening her heart, which would be the perfect opportunity to restore her memory and finally make her Inverse. Westcott showed no regard for Nia's life after extracting her Qlipha Crystal, and he began to view her as a hindrance after she survived and impeded <Beelzebub>'s functions.
Mukuro Hoshimiya[]
Westcott was the person who discovered Mukuro sleeping in outer space using <Beelzebub> and sent an entire squadron of airships to capture her. Despite suspecting they would be unsuccessful, Westcott was still surprised and overjoyed upon learning just how easily Mukuro had defeated the small armada. He then used <Beelzebub> to gain knowledge on how to have her enter her Inverse Form. However, he was never able to implement his plan, as he and his forces had to recover after being defeated by Ratatoskr.
Shido Itsuka[]
After Ellen told Westcott about a human that could control the power of the Spirits, Westcott took an immediate interest in Shido.
In Volume 7, Westcott ordered Ellen to attack Shido, using him to drive Tohka into despair and make her go inverse. He succeeded, with Shido being nearly killed by Ellen and Tohka assuming her inverse form. After making Ellen fight Tohka, he withdrew but not before stopping himself after calling Shido by Mana's last name: Takamiya. Westcott says the name "Itsuka Shido" in katakana (イツカ シドウ), likely due to his knowledge of Shido's past life as Shinji Takamiya.
In Volume 9, when Westcott and Ellen talk about capturing the Spirits, Westcott considers it might be better to leave Shido alone so the bond between him and the Spirits could grow even stronger. Then, they would kill him to make all the Spirits go inverse. Westcott would later follow through with his word during the events of Kurumi Refrain; however, his strategic attempts at Shido's life would be foiled by Kurumi.
During the war between DEM and Ratatoskr, Westcott singled out targeting Shido, wishing to acquire his Reiryoku before going to meet <Deus>. The fight proved that Westcott had the foresight to use <Beelzebub> to research all of the Angels in Shido's arsenal beforehand, only to show a rare moment of surprise over Shido using an original technique to defeat him. After losing, Westcott remarked that Shido's decision to be merciful reminded him of his childhood friend Elliot. However, he also warned that Shido would come to regret that decision.