lol, Alviss if you have to ask for help just to summon one there is no way in hell you will be able to control it alone. If you want an evil demon (which you would likely have an even harder time controlling) in your body then I think you should find out how to get it on your own.
Yes there are plenty, or you could go an a merry jaunt through the etheric realms to Hell and very politely talk to one instead of arrogantly commanding one to come to you.
Do you honestly believe you can control something who is ancient? something that has knowledge beyond what your brain will ever comprehend?
Oh and for the immensely egotistical, define "evil." It is nothing but a point of view and a set of beliefs on what is right and wrong. Nothing is evil, to believe that because something doesn't fit in with what you call "good" does not in the slightest mean it is evil. So to call a higher entity "evil" is quite probably one of the most ignorant things anyone has ever said.
LOL alvis.. How old are you? Like ragnorok said how the hell do you think you will control a demon if you don't even know how to summon one? I'm sure you think it's pretty cool what you are saying but it's not..
Alviss I think you are living in a world of fantasy. You think you could control a demon to do your binding or you just want proof for there existence. I know one thing for sure you haven't read much about demons just at least 1% and another thing is no one will give a spell to summon a demon for your riduclous fun.