Cosima Niehaus is a clone of American origin on Orphan Black. She befriended Sarah Manning whilst she was under the guise of Beth Childs shortly after the death of fellow clone, Katja Obinger. Since then, Cosima has aided Sarah in her pursuit of their true origin, alongside Alison Hendrix. After discovering that the individual whom she had become intimate with was also acting as her monitor, Cosima fled to Canada from the United States to join Sarah and Alison. Unfortunately, during this time, Cosima developed a respiratory illness which Katja had also been a victim of. Cosima was eventually able to uncover the fact that they are property of their creators.
Much of Cosima’s past is still unknown, except that she is from San Francisco, California, studied at UC Berkeley, and is currently completing her PhD in Experimental Evolutionary Developmental Biology at the University of Minnesota.
Beth Childs managed to find her and another clone, Alison Hendrix, through a facial recognition program after Katja Obinger contacted Beth about three other clones in Europe. They had been looking after each other ever since. Meanwhile, the sick Katja, who wanted to see Cosima, whom she knew as a scientist, was asked to submit proof of the European clones’ predicament to Beth. Prior to Beth’s suicide, it seemed that Cosima constantly called her for updates.