Kathrin Fricke (born 13 October 1984), better known by her pseudonym Coldmirror or her nickname Kaddi, is a German video and Internet performer. The pseudonym was inspired by the song "Creatures That Kissed in Cold Mirrors" by the band Cradle of Filth. She operates one of the most popular German YouTube channels, moderates radio and television programmes, and publishes blog and vlog entries.
Fricke was born and raised in Bremen and studied art history and philosophy at the University of Bremen. She finished her bachelor's degree in 2010 with a research paper about the production of video films and a film project about Internet and video game addiction.
According to her own statements, she suffered from strong depression for domestic reasons. In an interview on the YouTube channel "clixoom" she explained that, among other things, the Harry Potter series and the desire to know how it would continue gave her energy and safeguarded her from suicide. However, she stated that this was not necessarily due to the books' exciting plots, but rather simply "having something that you can look forward to."