Human
Humans are simply that, a human. They are not allowed to have some crazy super human ability or anything of the like. They are normal human beings with normal human properties. That doesn’t mean that they are flat, boring, and stupid, humans are fascinating (as we all know). You are allowed to have common human ailments, or whatever could happen to a human.

Cyborg
Cyborgs are half machine, half human. You could have a machine arm or machine legs that your cyborgs has. Here you can have machines that give you somewhat super human properties. Mechanical legs can make you run faster, you could be stronger, doesn’t matter. Cyborgs are part machine. You could have part of your brain a machine, like a computer, as well. Be creative.

Android
An android is a complete machine. It could act like a machine and even look like a machine, but it must have some type of humanistic quality. Your Android could also look completely human and act completely human. You can go whatever direction you would like with this, and also keep in mind super human abilities are very possible. An android is a machine and can do things like a machine.

Alien
Here is where you get to go crazy. Green skin, fifty eyes, seventeen tentacle like arms, have fun and go crazy. Again, keep with in the laws of physics, but be creative. You have the most amount of freedom when creating an alien and it can be anything you like, pretty much. Really outrageous things have to be approved by me first. Other then that, have fun and lose your mind.