Non-humans and bestiary:
Aliens: Aliens look like anthropomorphic cats. They also share many of the same traits as cats. They are generally about the size of humans.
Cat girls/boys: Human-alien crossbreeds that share traits of both races. They are generally regarded as cute by both humans and aliens.
Androids: Intelligent robots that generally exhibit a humanoid appearance. They are capable of acting independently of their creators. Groups of andriods have been known to establish cities on their own.
Anthropomorphics: "Anthros" for short. This is a term used to broadly refer to the number of anthropomorphic animals that have popped up in the years after the attempted invasion. The most common ones are the cat aliens. The second most common anthros are dogs. These are an unexpected offshoot of werewolves. The werewolves tend to have mixed feelings about their existence.
Dragons: There are many creatures which might be called a dragon, but those that are scientifically classified as dragons always have some degree of intelligence. Originally, dragons often engaged in their typical behaviors of snatching cattle and princesses (or the closest thing to them) and taking them back to their cave. Some dragons even took a liking to eating humans. This generally stopped when the missiles started keeping dragons away from the real humans. Dragons hate zombies with a passion because they can look like humans when viewed from a great height. They have since known to check to see whether a human is dead before eating him.
Goblins: Goblins are short and green with big pointy ears and noses. Other than that, they are surprisingly varied. Most goblins are unscrupulous and rather ugly. They don't often hold high-position jobs well, and they are typically always armed with something small and easily hidden. Goblins do have a knack for tinkering with mechanical things. Their more grandiose contraptions tend to be the primary contributors to the world population of feral mechanoids. A respectable number of goblins around the world answer to the enigmatic goblin king, who resides in his castle at the center of the world's only goblin nation.
Zombies: Typical brain-dead, shambling, walking, rotting corpses which spend most of their days looking for brains. Why they always look for brains is a mystery that scientists have been studying for years. Other more enterprising individuals are developing brain-scented zombie lures.
Dragon-zombies These creatures are very rare, as dragons are only susceptible to zombie infection if killed by zombies. Other than being the corpse of a dragon and able to fly and crush things and having giant teeth and claws, they're not so different from a regular zombie.
Mechanoids: Non-humanoid robots. They often have little or no intelligence. Many of them were former war machines used against supernatural threats. They are sometimes imbued with magical items that, when malfunctioning, cause them to disobey their masters and go feral. They have occasionally been kept and herded like cattle by androids.