I am very sorry, but this is impossible. And don't be so sure they are to come back by themselves... I have lost my grandfather before even I was 10 years old. I have saw him only twice I think-I remember only the second time. It doesn't really hurt me because I have learnt to live without him, I also know after life exists...
You can work with spirits though, you can summon that person and communicating with them.
Don't even try it! You'll regret doing it but it would be too late! Once it's done can't be undone and it wouldn't even be the way you thought it would be like!It would be a great mistake you'd Remember every day of your life...I guarantee you won't like it.
Lizzy i'm not sure if it's Practical Magic or FullMetal Alchemist you saw for your information but those are fictional stories. you cannot bring people back from the dead, therefore it won't come back as something dark and unnatural [as seen in those shows]
magick is a force of nature. death is a part of nature. once something is dead, it stays dead. i probably sound heartless but that's the sad fact of reality. magick cannot contradict nature, you cannot resurrect the dead.
there are ways but sadly they involve body parts and being in possession of the persons body and all of that is very illegal and plus the way to go about doing this is lost in time and considered necromancy... careful dabbling in some of this stuff... it will blacken your soul..
Cerberus, this is not a movie, you cannot Frankenstein a body and bring it to life. Once you are dead, you are dead, no amount of piecing together a body will fix that.
Also a soul is a belief, some people don't believe in a soul and there is no accepted proof that souls even exist, whether something blackens a soul or not is pure speculation.
Not to be callous, but why do you want to bring someone back anyway? If there is an afterlife, and if you believe in it, then thing of what you'd be pulling them away from. I'm kind of pulling from Buffy here, but maybe take the advice of trying to work with the person's spirit rather than looking for an impossible spell.