Not sure if this is worthwhile posting since others have bitten (heh) first, but I was reading another thread and your sig linked to here saying you're looking for someone. If not my bad, but if so I have an original character from my own story who might interest you. His background and mentality is a lot to write out, but to put it simply he is a hunter. He, as I tend to write him, has a major aversion to killing (yet has, will again) who was quite fascinated with the vampire concept all along. On discovering they exist this fascination, an attraction, makes him guilty. His father (a hunter) drags him all over the country on pursuit after his mother dies, and in a sense trains him from a fairly young age though he never participates directly (he learns more about the detective side of things) spends a lot of time riding in the cab of his dad's truck with corpses (no turning to dust in this setting) thus ends up quite desensitised to death and violence, particularly theirs. Has it drilled into him that they are vermin and must be wiped out.
Now, depending on what stage in his development you choose to have her meet him, he could be very different. As a hunter early on he is strong, energetic, talented, totally focused and dedicated and possesses an almost instinctive flair for violently outmanoeuvring others and causing them a great deal of damage, obsessively tinkering with different kinds of ammunition, blades, etc., to make them more effective. On a personal level is negatively passionate towards them as his fathers influence and greater social taboos leave him with wracking guilt for his attraction. He hates them, wants them gone, for being compelling and for drawing his interest as though they do it intentionally. Principally sees them like someone in the tropics would the malarial mosquito, and is not cruel about it but simply does not want them to exist anymore. It would be possible to get through to him, albeit difficult, at this stage.
Meet him later and he acknowledges they are not all bad however this only alienates him from them further in that now he feels they have a choice, and are deliberately malignant; it is almost impossible for one to earn his trust though he theoretically is open to any who are not immanently hostile or violent. Admits he finds them compelling and so no longer truly hates them in fact has a profound respect, an almost empathic attitude, toward them such as the great hunters do for their chosen prey (consider the way Jim Corbett felt about big cats) yet for all that is, in all honesty, not much of a hunter anymore. He has lasting injuries, problems from a life of doing the job, and can almost never bring himself to kill anything anymore, cannot keep himself in peak shape. Makes up for it to an extent with sheer knowing and guile, still has the same focus and determination, is ridiculously talented now, but it really is not enough anymore yet he is too dogged and has a bloody-minded, fatalistic persistence that gets him through albeit at the cost of usually ending up in hospital for some time after every foray. Naturally this makes the next harder which leads to more injuries; is living on a very small amount of borrowed time and appreciates it on some level. Keeps quitting and then taking on 'one more,' and needs a reason to stay quit.
Or after retiring, but I am too lazy to write this up. Let me know if you are interested. If you would like to see more the excerpts in my role-play suggestions for my vampire game involve him.