Devligus Devotindos - RKA bad guy
Dr. Doppler - Mega Man X3 bad guy
Doppleganger - Maximum Carnage bad guy
Doppleganger - Symphony of the Night bad guy
Donkey Kong
Diddy Kong
Dixie Kong
Dave - real name of Metal Gear's Solid Snake
Diane - According to the US manual, the co-pilot of the Thunder Force II