Private Cesar M. Lopez is a character mentioned in Fallout 4.
Cesar M. Lopez visited the Greater Mass blood clinic in 2077. He was there for a standard STD test which came back negative. According to another entry, there is a 90% chance that he is the father of Alexis J. Martine's unborn child. Due to a standing order issued by General George M. Martine, the commanding officer of Fort Hagen and Alexis Martine's husband, the results of the paternity test were reported to the general.
Caesar M. Lopez is mentioned only in Fallout 4.