Are there races other than human? In Boku no Hero Academia, there are many people who have a special appearance, different from a human appearance, like Tokoyami for example. 

Is this something normal in the world of My Hero Academia where someone can have a different appearance caused by their quirks? Or is it more like in Dragon Ball where there are many races that if someone isn't human, other people see it as okay?
They are quirks. Mostly, transformation quirks. They are human. Though there is a real rat (an animal) character I know. The principal. He was a product of experiments. I don't know if there are other kinds like principal.