Mirror is a terrible, horrible person that's done terrible, horrible things. But they have never been permanent. Mirror is also someone who's protect my team, and, while alarming at the time, took Quartz to her realm to prevent the earth from taking him. She's also a friend to Lepus and Feathers, and genuinely cares about anyone who gives her the time of day. She not only thrives on hate and fear from the blanks, but also love and companionship, not unlike how we humans do.
Of all the Judges I've met, she's the most human, even if she's artificial.