Who made up mythical creatures like fairies and werewolves and vampires?

They come out of many different cultural stories to explain events. The Irish/Celtic cultures told stories about fairies stealing people's minds/life to explain unconscious people. The early fairies were mean creatures and not the nice pretty things we see today. The vampire came out of the fear of live burial. Centuries ago it was easy for people to be buried alive because the science couldn't tell when a person was unconscious or dead. The fear was so great that people bought coffins and tombs with bells in them so they could ring them if they woke up buried. When graves were opened and a burial had buried someone alive they showed signs of a struggle. All of these things were picked up by writers in the 1800's and thus we have the stories we have today.