Rebecca is a solo and a secondary character in the series. She is a very sharp-tongued young woman and tends to be extreme and unpredictable. She is often shown going all out in fights, sometimes even laughing maniacally. Nevertheless, Rebecca is loyal and does everything for the crew of Maine, including supporting newcomer David where she can.
Rebecca has feelings for David Martinez, as she mentions that she wasn't okay "playing just friends," and sarcastically comments to Kiwi that perhaps she should change her appearance and attitude to seem more like the girls David is attracted to.
Background
Rebecca was an edgerunner of Night City, who was always fighting with her brother Pilar. The two siblings often teamed up with Maine and his crew to conduct mercenary jobs. Their daily life outside of work was tense, and they would always fight with each other due to Pilar's provocative behavior. This caused her to decide that she would be the person to kill her brother someday.
Timeline
Rebecca first met and worked with David Martinez during the limo heist, distracting Maxim by spilling booze on him and sensually cleaning it.
Later on in the series, Pilar was killed by a cyberpsycho, sending Rebecca into a rage, rushing the cyberpsycho by herself, but she was eventually stopped by the rest of Maine's crew.
Before the Faraday heist, Rebecca tells David that she is concerned with his health and that he should go light with the chrome. Even though David rejects his situation, Rebecca confronts him with the fact that she knew about his seizures and cyberpsychosis. David ends up asking for assistance from Rebecca and tells her to inject him with tranquilizers when he starts to slip out of his consciousness.
At the end of the series, during the attack in Corpo Plaza, Rebecca reunites with Lucy and tells her she was glad that she was safe for David's sake, before being crushed moments later by Adam Smasher, her last words being "F*** You."
