Julia

Interactions
Julia can be met every day at work in the medical office since morning, and in the commons during lunch, sitting with John. In the early afternoon Mrs. Dee will join her in the medical office; you will not be able to talk with her at this time. Since chapter 3, she no longer visits the commons and stays in her office all day. You can chat her up, bring her tea and ask her for contraceptives. Julia's transformation is completely story-driven, you cannot give her serums at any point.

In conversation, Julia appreciates professionalism, but as of yet, effectively nothing you say or do with Julia outside the Chapter 2 main quest arc changes any options for you or how she treats you.

Story
Like Tory before her, and Lauren after her, Julia is Chapter 2's antagonist.

Though it initially went unnoticed, one of the girls "acquired" by The Company was close to Julia, who swore revenge by seemingly mercy-killing the girls to make Ms. Dee's branch look bad. She initially was doing this a few years before MC is recruited, but the reason she stopped is unknown, or what made her start up again.

Ironically, her questioning does not really yield any indication that she's the culprit, but rather evidence seen over the course of Chapter 2's story is what makes it clear it's her, such as her being seen leaving your lab when she has no business there, or closing and locking her door when she spots Penny looking in on the second girl after she is grievously injured.

Failing to catch her by either giving up or injecting the wrong person causes a Bad End where Ms. Dee's branch is shut down, and her other predictions of what will happen if the culprit isn't caught come true, including Tasha and Ms. Dee being forced to take responsibility for the incidents and being "dealt with" per Company policy.

Injecting her with BMB-1 causes her to confess her crimes and her motive. As she's taken away, Ms. Dee and Diana talk to you and Penny about what to do next, with Diana mentioning Julia's daughter Katie as the client's third girl due to Julia killing the previous two.

From then on, she's usually seen in her office being gangbanged and bukkake'd but at some point in a given day is still able to provide birth control to MC in spite of her fate.