A/N: Wow, more requests than I was looking for! Thanks, I wrote them all down so I don't forget them all! Although I disregarded two for not knowing who the character is. (I haven't read LotR yet, but I still know who Gandalf is, so I'll do that one.) Also, I think it depends on when the duel happens. If it's before Sirius dies (how else could it happen?) he would win. Neville, when he's older, I think could beat Sirius.
Also, 101 reviews! In only ten chapters! Thanks a lot! :)
Neville Longbottom is a wizard in Harry Potter's year, and also one of his close friends. He was a Gryffindor.
Sirius Black was one of the Marauders, and Harry Potter's godfather. He was also in Gryffindor.
"This was such a hard choice, but, Fred, I have decided on Sirius."
"Why?"
"Well, I have no clue who would win, but he won the vote."
"That makes a lot of sense."
"Doesn't it, though?"
"Well, I chose Neville."
"Why?"
"Have you ever seen him duel?"
"…yes. But Sirius was a Marauder."
"…like the Marauder's Map?"
"Yep."
"Why didn't you tell me? I COULD HAVE ASKED HIM ABOUT HIS PRANKS AND ALL!"
"I only just found out in 1999!"
"THAT WAS YEARS AGO!"
"…So? He's dead anyway, and you never mentioned the Marauders anymore…"
"You will pay after the show."
"Er, speaking of the show, who would win in a duel, Dolores Umbridge, or Dolores Umbridge from A Very Potter Sequel?"
"…A Very Potter Sequel?"
"I'll show you later."
"Alright."
A/N: I myself think the book Umbridge would win, but I haven't seen AVPS, only part of AVPM. So, I really have no idea.