- You may be looking for Karen (GTA IV), the receptionist for the Goldberg, Ligner & Shyster law firm.
|Spoiler Warning: Plot and/or ending details are in the text which follows.|
Karen is an undercover government official who works for U.L. Paper. Before her identity is revealed, she becomes Niko's girlfriend under the false name Michelle.
After unveiling her identity, she confiscates Elizabeta's cocaine, and naturally, she and Niko break up.
It is hinted by the boss at the U.L. Paper building that she was in a similar situation as Niko. When she was recruited, she had something to lose but nothing to live for. She is also a smoker, and lies to Niko that she works with Mallorie.
It is unknown when Michelle got assigned Niko's case. There is evidence that it is from the start of the game, or before Niko arrives in the city; as she is lying to Niko on their first date.
Due to the nature of the U.L. Paper's activities, it was likely discovered that Niko was headed to America, and due to his exploits in Europe, had unknowingly got himself noticed by the CIA. After digging up info on his family and finding that Roman Bellic was related, Karen was told to make friends with Mallorie, knowing that Niko would inevitably make contact with them.
During a mission for U.L. Paper, Niko asked what Michelle's reward for delivering Niko was, to which he replies: "Michelle, Karen. We gave her her life back."
Despite her intentions, it appears as though Karen genuinely fell for Niko during their time together. This is due to the fact that she is sometimes surprised and upset, if after a fair amount of dates, Niko doesn't ask to have sex with her. She is also visibly hurt when she is forced to betray him.