Mitsuko Tokaji worked in cognitive sciences aboard Talos I. Together with Morgan Yu, Mitsuko created an idea to implant human neurons into Typhon. While at first shot down by Alex Yu, he eventually uses the idea in his own projects.
She also monitored the behaviour of Volunteer 37. It seems that she lost some fingers while doing it, presumably because Golubkin ripped them from her hand. Tokaji was transferred into the Traumatology service but her fingers could not be saved.