I too was very disappointed in the lack of future info on all the characters. But I believe that this lack of info is because it makes it easier for JK to make a future book. I saw a Today show interview that she is planning to write an encyclopedia of all the characters and their full stories, e.g. what happened to all of them, plus whatever info didn't make it into the books during editing. So may all our questions be answered in another 2 years!
From interview:
In her first tell-all interview since the release of “Harry Potter and the Deathly Hallows,” J.K. Rowling told TODAY’s Meredith Vieira she "probably will" publish a Potter encyclopedia, promising many more details about her beloved characters and the fate of the wizarding world beyond the few clues provided in the seventh book’s epilogue.
“I suppose I have (started) because the raw material is all in my notes,” Rowling said.
The encyclopedia would include back stories of characters she has already written but had to cut for the sake of narrative arc (“I've said before that Dean Thomas had a much more interesting history than ever appeared in the books”), as well as details about the characters who survive “Deathly Hallows,” characters who continue to live on in Rowling’s mind in a clearly defined magical world.
Hogwarts, for example, has a new headmaster (“McGonagall was really getting on a bit”), and Rowling said she can see Harry going back to give the "odd talk" on Defense Against the Dark Arts. That class, by the way, is now led by a permanent professor since Voldemort’s death broke the jinx which didn’t allow a teacher to remain in the position for more than a year.
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