A Slytherin taking Muggle Studies? A Hufflepuff at the top of her class? A Ravenclaw failing a subject? A Gryffindor associating with someone not in their own house? Not everyone fits into their house stereotypes at Hogwarts... OCs
A group of Mary Sues enter Hogwarts, but find their typical charms and perfections somehow failing to get the reactions they usually warrant. Harry and Ron finally figure out the Sues weakness, with Special Guest Appearance by Hogwarts' Resident Man-Ho.
(UPDATED) Chapter Six: During a weekend visit to Hogsmeade, the lurking Dementors, still on the search for Sirius Black, cause Justin to relive the moment of his petrification from a year ago, and Cedric consoles him. R&R