December

December is a reprogrammed Operator that guides Morgan Yu through the Talos-1 and appears in Prey (2017).

Overview
Unlike January, December encourages Morgan to escape by using Alex Yu's escape pod. If you are too late December will be destroyed by an unknown assailant, but its body can then be looted for the code for Alex's safe. However if you are in the Neuromod Division when December is destroyed, you see that the assailant is January, who claims that December was either a malfunctioning Operator or a work of Alex's.