Fenix is a convict who is reinstated into the Coalition of Ordered Governments' (COG) military to assist a last-ditch mission to destroy the Locust Horde.

Fenix led a famed military career in the COG's previous conflicts, but was arrested after leading a failed unauthorized mission to rescue his father, Adam.

Fenix joins his close friend, Dom Santiago, in Delta Squad as they succeed in helping the COG military deploy a missile strike against the Locust Horde.

During a heated exchange between Marcus and COG First Minister Mina Jinn, it is revealed that Anya had passed away at some point during the 25-year antebellum period due to unspecified birthing complication issues.

[5][6] Fenix was added as a cosmetic outfit with Kait Diaz to Fortnite Battle Royale on December 9, 2021, During Chapter 3 Season 1 in the Item Shop.

"[13] Empire also ranked him the 45th greatest video game character, adding that "[o]f all the marines, in all the alternate galaxies, in all the fictional universes, the gruntiest, muscliest, most trigger-happy of them all is one Mr Marcus Fenix.

"[19] Computer and Video Games named him as the PC gaming's ninth worst character, contrasting him with Garrett (ninth best) and calling him "a mish-mash of Deckard from Blade Runner and Eeyore from Winnie the Pooh, constantly lamenting the situation and grumbling at any levity and delighting only in the occasional profanity" and adding: "Desperately in need of a hug, or maybe a tug, Fenix is the least likeable hero since Billy Zane played The Phantom.

and listed him as one of the worst dressed video game characters of 2011, adding that "Anya must be Helen Keller if she's attracted to that walking grime beast.