You are human and always will be. Anyone who claims to be anything else is a liar. Magick cannot change or alter your dna. Magick cannot physically change you in any way, shape, or form. So you cannot become a demon, vampire, fairy or mermaid. You also can't change genders or your hair or eye color. Those are only possible with surgery, hair dye, and contact lenses. Magick works with nature to create changes within the mundane.
Yeah, if it seems too good to be true, it probably is. Take some of the stuff on this site with a grain of salt.
By: Lark Moderator / Knowledgeable Sep 20, 2017
Post # 5
As the others have said, it is not possible to become anything other than the human you already are.
It is true that there are spells on this site that suggest otherwise, but such spells are fantasy and do not/will not work. We have a lot of spells here that were either entered by someone who doesn't really understand genuine magic, or by someone who is trying to mislead others with intentional misinformation.
It is possible to learn more about and to work with entities that might be considered "demons". You might try looking into the Goetia, and particularly into the book " The Seal of Solomon " which talks about such magical workings.