It doesn't change them at all — I've seen him bring people back who were trampled by a horse so badly they talked out of the other side of their face. [ There's an image for you. ]
Ton examined me awhile back. He said that it seems like I have some damage to the lungs - nothing bad but it's not like it's as if I wasn't strangled and thrown into the ocean. I don't think anything... changes. It just stops being dead.