Mars (mentioned)

Mars is a mentioned only character, revered by members of Caesar's Legion.

Background
The worship of Mars is mentioned Legate Lanius, commander of the Legion army, informs the Courier that the Son of Mars granted him his name and that he is whom he serves. If the Courier chooses to align with the Legion, Lanius will leave them with parting words on their way to Hoover Dam, imploring them not to fail Mars or the Legion, as "Mars' eyes are upon [them]."

Centurions tell the Courier "may the Son of Mars go with you" and a Veteran Decanus asks "Mars favors the bold, does he not?" if they fight on Caesar's side during the Second Battle of Hoover Dam. Legionaries claim "by Mars these weaklings die easily."

The Fallout: New Vegas Official Game Guide states that Caesar refers to himself as the "Son of Mars" and the belief system which they follow claims that Mars cleansed the Earth with fire to facilitate Caesar's conquest.

Appearances
Mars is mentioned

Behind the scenes
The worship of Mars was part of the real world Imperial cult of ancient Rome.