Serial Designation J

J is best described as a "lethal workaholic", as she is incredibly dedicated to her job - even using corporate jargon like "synergistic liability" and "fourth-quarter profits" in place of insults or vulgarism. J has had a penchant for obeying authority and following orders as far back as her days as a Worker Drone, where she refused to help Tessa free herself from her chains as "corporate had spoken".

Although J is not as sadistic and insane as V is, she does look down on others who are not as good as her. This is best shown in J's relationship with N, as she despises him and tells him that she would personally kill him if their company allowed it. J's dislike of N goes as far as to infect him with a virus as soon as he starts to question the company (even though there was a valid reason for doing so) while also taking glee in doing such an act. This is made even worse upon the reveal J knew they were helping Cyn and not JCJenson, showing she really did just want an excuse to kill N. Even in flashbacks to the Elliot Manor, J was already shown as abusive to N, kicking him for no reason, and telling him to kill himself.

J is also arrogant, domineering and prideful, as she enjoys insulting others. This proved to be her downfall, as after she incapacitated Uzi, she took her time with a monologue instead of finishing her off immediately which gave Uzi the chance to stab J with her Nanite tail. Despite this, J praises her comrades if they are worthy. This is shown when N supposedly gets past the Worker Drones' doors and, despite her low opinion of him, J genuinely congratulates his efforts and rewards him with the thought of having a JCJenson-branded pen, an item they both consider an accomplishment.

Despite her arrogance, J is not incapable of showing fear. This is demonstrated in N's memories of when they used to be Worker Drones working at the Elliott Manor, where being in the presence of Louisa is enough to terrify her, as well as when Lizzy, Thad and Khan appear to attack her with a railgun, making her systems warn her of a "Prior Hazard" as her face bears an unnerved expression. However, she has a positive relationship with Tessa, whom J is genuinely kind and respectful towards.

However, J's true motivations are revealed in the finale, where it's shown she's aware Cyn murdered Tessa and, in spite of this, is assisting her in the attempted destruction of Copper-9, focusing on being on the "winning team" in hopes that Cyn wouldn't kill her if she aids her. Despite briefly offering V a chance to join her and Cyn, she later distances herself from her former allies, coldly stating she never needed V or N.