Dear WS,
GG was actually the one who introduced me to the term "headcanon" (I forget if she spells it with one "n" or two, but I'll blame it on her anyway). Basically, in her headcanon, all of the good guys in the Harry Potter series survive. And I do mean all. Including the ones we don't know very well, like Moody. Headcanons aren't much comfort to me, because I can't get over an author killing one of the characters. Even if I make up parallel stories in my head, I still can't conscience letting characters the author killed come back to life--which either makes me more of a purist than GG, or more gloomy in general. So for me, Regulus Black, Severus Snape, and Remus Lupin (my three favorite characters) are eternally dead. For GG, they're alive and kicking. Well, possibly not Regulus, but I think both Snape and Lupin are.
Sincerely,
Glen
P.S. Actually, GG probably doesn't want Snape kicking. She's a Gryffindor....