Rosa is a character featured in the Call of Duty: Mobile, introduced in the Season 3: Tokyo Escape Comics and was released as a playable character on June 11, 2021 during Season 4: Spurned & Burned as part of the Drillhead Draw. 
- Soap: "Jesus Christ... you've been busy."
- Rosa: "I was bored. You Soap?"
- Soap: "I am. And you're Rosa. DEA, CIA, Angel of damn Death for the cartels."
- — Soap and Rosa meet.
Rosa served as an agent to both the Drug Enforcement Agency and the Central Intelligence Agency, working against various drug cartels in Mexico. She specializes in stealth, sniping, and infiltration. At some point, she was contacted by John "Soap" MacTavish and met with him, who offered her a new job - working alongside the United Anti-Terrorism Coalition.
Working with the UAC
Rosa would later be present at a meeting with the remaining UAC members, of whom included Soap, General Shepherd, Captain John Price, Alex, and Charlotte "Charly" Johnstone. There, Price informed her that she and Charly would be accompanying his team to Tokyo.