Thursday Next from the Thursday Next series by Jasper Fforde (I could check in with her if Fforde would ever publish the last book in the series!)
Eleanor and Park from Eleanor & Park by Rainbow Rowell (I so want to see how their lives and relationship turned out!)
Jonathan Strange from Jonathan Strange & Mr. Norrell by Susanna Clarke (But only if I get to go to this magical England that he lives in, because that's really what I want to experience again!)
Mackenzie and Delancey from Pretense by Lori Wick (I have read this book probably ten times since I first discovered it in high school. And it always ends right at the good part!)
Harry, Ron, and Hermione from the Harry Potter series by J.K. Rowling (I know Rowling has published other short stories about them, and I honestly haven't been that interested in reading those. I'd rather check in on Harry, Ron, and Hermione in person. ;)
Auggie from Wonder by R.J. Palacio (I'd love to know how sixth grade went for him - or high school or college, for that matter.)
Scout and Atticus from To Kill a Mockingbird by Harper Lee (Oh, wait - I get to do that in July!!)