In order to understand Cassie, you first need to know about a certain drone that came a little while before the events at Elliot Manor... A drone named Olivia. This story isn't about her, so I'll try to keep her section brief, but she was one of the first solver hosts. She was a servant/maid in the mansion of Tony Ash, someone with quite a high ranking in JCJenson. Now, let's get into the actual story... Mr. Ash had a teenage daughter named Cassie. Cassie always preferred computers and anything logical rather than people, so she quickly took a liking to the drones in the mansion. Drones didn't need to be kept happy. They wouldn't complain about her being boring. When Olivia was infected by the solver, Cassy made an attempt to hack into her code and delete the program. She managed to delete about half of the code from Oliva's memory, but was killed by the solver before she could finish... Cassie's tampering caused Olivia to have an odd personality. She was influenced by the solver, yet retained a bit of her original personality. She tried to make a drone copy of Cassie... She uploaded (slightly edited) memories to it, as well as her personality... And the result? The drone you see in this project. This drone wasn't truly Cassie, but it behaved almost exactly the same. Well... with ALL of that out of the way, I believe that Cassie belongs in Zone 2, due to her extensive lore and backstory. Ask any questions you'd like, this is just the core of her story. She's also capable of using the solver, although she's unable to create [NULL] and her abilities are severely weakened, as Olivia herself only has about half of the solver.
Vector model created from an altered version of @LetsNotQuestionWhy 's Murder Drones Lizzy Vector Music is Memory Reboot by VØJ x Narvent