I want one!

Half-life has it and Minerva has it, now I want one too. I'm talking of course about the ominous character who seems to be in full control all the time. My original character who had any sort of similarity to this was the rebel who speaks to you over the radio. In the back of my mind I've wanted a character like this but doing it correctly in a way that interests players rather than breaks immersion is hard. Instead I want a character that adds to immersion and relatedness in the game.

This character, I've decided, is going to be a person with no ties to either the rebels or the combine who lives somewhere deep inside the complex that you're exploring and the combine are taking over.