So, a quick profile of Quinn - and I'm not joking about this. Of course, that's based on what we know and what we saw so far.
She's s sociopath. The telltale sign is her lack of empathy and her nonchalance towards other people. Maybe she is that way by nature or it has something to do with drugs - we don't know yet.
She is manipulator, as we can see in her room scene with Camilla, but she doesn't shy of using the force like when she rapes MC or ordering Maya very rudely to find another guy.
She doesn't show any emotions. Her only goal is money and she'll do whatever she could to get it.