No, it has to be a demon at the time when you are dying. No demon from a future time.
Can i say That I want to make a contract first off having me serve me until I'm a demon myself? Can't i have that as a reason? I honestly want to know, no joke seriously. please mail me the answer e-mail is ( firstname.lastname@example.org)
Yeah, but you can't get everything you want in the world, right? This power is based on a manga where people can only be brought back to life once, but isn't in the manga at all. The manga is "Inuyasha."
Why? What if you died again? I'm sure the demon wants more goodies...
Forgot to put that it can only be used once.