Kozai Halcarax

Unlike many of your "average main characters", Kozai wasn't born to a poor family in dire straits with some kind of ancient lineage. No, he actually belonged to a rather rich family, who specialized in dentistry. As such, they owned a rather nice large house by a lakeside. Early on in life, he took a keen interest in something that his parents disapproved of. As an only child, though, he was a bit spoiled in his younger days, so he really didn't care. As a matter of fact, he began to pursue his "hobbies" with great interest. And by "hobbies", he meant killing.

Not the kind of murderous crime, oh no. Rather, he'd take various small furry animals from the area around his family's property and subject them to all kinds of deaths. Furthermore, he kept meticulous notes. After a while, death by simple bladed weapons or chemicals no longer satisfied him.

"Dust!" He thought to himself. "If I become a hunter, I'll be able to measure all kinds of deaths, AND gain access to dust with which to continue my observations. I'll be able to set up all kinds of controlled environments with it, with which to put to death..... Grimm. I've never been able to do that before, and it should help me quite a bit."

Naturally, his parents were frightened at this kind of attitude, but it was the best way to get rid of him. At this stage in his life, Kozai had cast aside all the immaturity of his younger years, having hardened it into a cynical, suspicious attitude of life in general. After all, death was certain, but life was not. And what was uncertain could betray him, and could interfere with his goals. That kind of existence was unacceptable, but there wasn't really anything he could do about it.

Kozai stared into the small cage, which was about the size of a fish tank. Within it, was a small squirrel. Ah, what a perfect day to start doing another experiment. This squirrel was one of the descendants of his original pack of subjects, was restrained, but it was quite easy to see the fear in its eyes. That was of no consequence, though. Kozai removed a syringe from the basket beside him, tapping it to get the bubbles out. He had already investigated the properties of inserting bubbles of air, oxygen and nitrogen into a squirrel's bloodstream (though the last two had been hard to purify).
This was filled with a pleasant liquid that he had refined from some of the fungi that had been growing outside of his property within some wheat fields. It was pretty poisonous, or so the peasants had told him. Well, only one way to find out... right?