I am a kagaijin. Although knowledge of my kind is widespread in most human circles, I shall assume that you do not know of them yet, and I shall fill you in on some of the details. The name "kagaijin" literally translates to "assault/violence person," and although a great number of my people feel it is an unjust label, it has taken root even in our own tongues. My people are a race of beings deeply rooted in the recent history of this planet, our ancestry dating back to the same origins as those of humanity.
We are shape-shifters and fusiloids -- creatures capable of mating with other species to create hybrid offspring. Although we are a virile and healthy people, we are unique, in that only males exist in our true specie. Although this might seem odd to most people, it is actually a very advantageous way to exist. Through the merging of other species, our male offspring inherit not only the qualities that make them decidedly kagaijin, but they also acquire the immunities and strengths of their female parents, who could be anything or anyone, as long as they are female. Others of my race have been known to acquire mates from the animal kingdom, ranging from creatures as diminutive as tanuki and foxes, all the way up the chain to grizzly bears and tigers. Others, like me, prefer human partners, and we make up the majority. Our true forms most resemble that of human beings, as we are bipedal, upright beings with high intelligence and a tenacity to survive that rivals all other creatures of this world.
In appearance, our true forms are often very frightening to humans. We typically stand at around eight feet tall, and our dull, slate-gray skin has the pallor of a corpse in popular human opinion. We have ten major digits on our feet, just as you do, and also ten major digits on our hands. These "fingers," however, are slightly more advanced than yours, as each digit sports twenty to thirty spaghetti-thin tentacles, each of which can shrink and elongate at will, and have all the tensile strength of an iron cord. These "fingercles" can stretch to over two feet in length, and they are very handy for ensnaring small prey animals, as well as embracing and pleasuring our lovers, among other functions.
Aside from these notable differences, we appear humanoid in all other respects. Our faces are virtually indistinguishable from those of humans, and they have been called beautiful by many of your kind, as they appear in many ways to be the ideal in human terms of physical symmetry. It is said that some of the Grecian sculptures of the male bust were thought to be modeled off of kagaijin facial structures. A major difference that is not visible on the surface, however, would be our tongues. Longer than our finger tentacles, and much thicker and more powerful, our tongues can taste a far greater range of subtle differences than your primitive human equivalents, and in addition, they are prehensile in nature, being able to grasp and hold onto things with all the tenacity of your own laughably feeble hands.
Our strength is incomparable in human terms, as any single kagaijin could easily defeat a small army of armed human men through sheer brute force within minutes. We are superior to humans in our analytical powers as well, and unbeknown to you, most of your most prized geniuses throughout history have actually been kagaijin in disguise. We are superior to you, as well as other creatures of this world, in virtually every way.
You might think that, as superior beings, we would be at least tolerated by human standards, but in actuality, the opposite is true. Humans see my kind as a threat, not only to the welfare of the young women we take as mates, but also to the purity of the human race, as the human female offspring we produce are in every way as human as any other human girl, making them undetectable as the offspring of a kagaijin. Simply the conditions of their births make them outcasts in human society, and so naturally, we do what we can to keep those conditions secret, further fueling the distrust and hatred of the rest of humanity. It is a sad state of affairs, but it is most certainly a common trait in humans to shun any whom they deem different or odd. Because of this, we kagaijin are very protective of our children, and we don't often allow the females to reintegrate into human society without ironclad identity protection.
Despite all our advantages and superiority, we also share a great many traits with humans that make us decidedly similar. We experience the same range of emotions and mental duress that you do, including such intangibles as love, hate, deceit, and depression. We are sensitive creatures with a strong sense of justice, for the most part, but we are far more devoted to the well-being of our own societies and ideals than to those of the other races of the world. Another trait we share is our insatiable drive to nurture our children. Humans and Kagaijin are among a very select few members of the various kindoms of animals that nurture their young throughout their entire lives, and although we may send them off into the world to eke out a living eventually, we never forget them, and we rarely want to.
It is quite remarkable that we have evolved in such a similar fashion, and it intrigues a great many of my people to know that although we descend from a common ancestor, at some point in our history, our paths diverged. Our path received the lion's share of things such as intelligence and strength, but despite that, our most basic driving motives remain the same.
Enough about my heritage, though. I shall now tell you a bit about myself. I am called Tsuyoken, or "Strong Fist" by my people, but among humans, I am known by the more discreet name of Tsu Akayama. In the human world, I am a college professor of archeology, and I teach several classes a day at Tokyo University. Although my job hours are rigorous and the strain on my shape-shifting abilities is great, I am more than capable of maintaining my identity in the human world, as are the rest of my kagaijin brethren. It is laughable to conceive that there might be humans capable of deducing that I am in actuality prince Tsuyoken, crowned ruler of the entire kagaijin race.