Someone who is obsessed with a fictional character and plans to marry them. They often carry pictures of them, know the plot all or most of their book or series by heart, can recite multiple quotes from the books, and have reffered to themselves as "Mr./Mrs. (character's last name)." Examples include: Edward Cullen, Harry Potter, Emmet Cullen and Jasper Cullen.
Mike: Yo Dude! My girlfriend Jane is such a Harry Plotter! She's so obsessed with Edward Cullen that she plastered her locker with pictures with him, and changed her Facebook name to "Jane Cullen."
Mark: Dude, I feel your pain. My ex, Mary, changed her name to "Mary Potter" on Facebook.