Gina Brasin is an agent with the MacGuffin Corporation.
That conglomerate is a large organization who "employed over three thousand people, worldwide". Many of those were, from the sound of it, in the security business, as would be classified Brasin. She was special among them, though, as "only four of those were designated that particular way: Instrument".
By Instrument, they mean she was a tool used to accomplish a particular goal but as one person, name unknown, we meet in the first recorded adventure so aptly muses, it is difficult to know if she was a scalpel, pulled in when precision work was needed, or a blunt instrument meant to smash anything and everything. Or both, it would seem.
We will learn so very little about Brasin in the four short adventures, one of which is really about a fellow agent. We get no idea really how old she is or how long she has been doing what she does or how she got her start or what motivates her to do the very dangerous and very deadly jobs she does. We know zip.
She is small in size. She is lithe and agile and flexible. She is very, very deadly. With a handgun or a knife or her bare hands or any object not tied down, she is deadly. And she is fast, on her feet and in her head, gauging a situation and reacting and then moving on to whatever might come next.
We also discover that she is both good at sex and very matter-of-fact with it. It is a bodily function, sometimes pleasurable and sometimes just needed. Whatever gets the job done.
And that is about all we ever learn of Gina Brasin except for the feeling that, in the commonly used phrase, if she told us more, she'd have to kill us. And she could.