Ghoul:
The ghoul is deadly. It feeds off human flesh and blood. Human food makes them sick and they could die from eating to much of it. If they do eat human food, furnace to hurl it back up before it starts to digest. Ghouls have super speed and strength, along with agility. Each ghoul is different from one another. Ghouls view humans as food and vampires as ghoul wanna bes. let's just say vampires have a history with ghouls.
Vampires:
I hope we all know what a vampire is. They feed off human blood and they have fangs. They have super speed and strength and some have magical powers. Sometimes they can be make or tan, it depends. They are different from a ghoul and you'll know that once you see them in action. Vampires HATE ghouls and they on my think humans as tools or food.
humans:
They do not possess any magical ability. They are normal and I seriously hope you guys know what a human is. If you don't then that's a problem. They can range from different sound colors, different hair colors, different eye colors and so many differences! humans hate all creatures, but some humans find them interesting.
Sirens:
They can swim and breathe underwater. They can morph into humans and into mermaids or mermen. All of them are different and some of them possess magical abilities. Sirens don't really like the humans or any other creatures.
Any creature/magical or not:
Pick the creature you want And be it! I can't really explain what it is because their are a ton of creatures in the imagination world and real world!
Any creature other than a god/goddess