J is best described at "lethal workaholic",given that she incredibly dedicated to her job.Altrough J is not sadistic and insane as V is,she does look down on others that are not that good as their designed task. This is best show in J's relationship with N,as she despides him and tells him that she would kill him if the company allowes it. J's dislike of N goes es far as to infect him with a virus as soon he starts to question  about the company(even trough there may be a perfectly a goodreason)