Genie

Genies are mythical beings, sometimes looking similar to humans, incased in a lamp, as most stories generalize them. Along with the power to grant three wishes to anyone who rubs the lamp, Genies are also very tricky and sometimes evil. So if you run into one, be very specific of your wish, broad statements could have catastrophic effects. However, in most stories, TV shows, and movies you see today, Genies are either protagonists or assistants to the protagonists (examples: Aladdin, I Dream of Genie).

In many cases, Genies are depicted as half-humans for bodies and having a wispy haze for legs. And some look like a regular, normal human. However, because Genies have been around for generations, its hard to know what exactly a Genie would be wearing. My guess is that they'll probably be wearing something from several centuries ago.

After the Genie grants three wishes, it is forced to return to its lamp until another person (other than the previous master)finds it. You may be able to wish for its freedom, but is not always a good idea. If your wish has a bad influence on the world, which is very likely because some Genies are sneaky, and you wish for its freedom, you may not be able to unwish the wish.

So if you ever find one, which odds are not extremely likely, be cautious.