Sophia

Sophia is Doctor Ludvig Maxis' assistant. Sophia was first mentioned in one of the radio messages hidden in an underground tunnel in Der Riese.

Original Timeline
Sophia was Doctor Maxis's personal assistant, and was tasked with delivering a letter to the Reichstag High Command sometime before the events of Der Riese.

In Call of Duty: Black Ops, it is revealed that she is attracted to Dr. Maxis and that he has started to view her as a distraction because he is attracted to her too. It is also revealed that she created the Monkey Bomb with an actual monkey as the test subject.

Origins Timeline
In Call of Duty: Black Ops III, she is mentioned in a cipher that readsSophia- cyclic redundancy check = fail. In Gorod Krovi, it is revealed that she is, in fact, an artificial intelligence named Strategic Operations Planning Heuristic Intelligence Analyzer, or S.O.P.H.I.A.. for short. The characters are instructed by S.O.P.H.I.A. to perform various tasks to initiate Ascension Protocol, which also includes retrieving Gersh for her to extract the information.

Trivia

 * She is seemingly disliked by Samantha, as she remarks "First I'll find Teddy, then Sophia" when acquiring the L96A1 from the Mystery Box.