! (The Exclamation Mark or 'Bang' Symbol): A short form for expressing the presence of a specific trait or defining quality of a character in a story that is not usually part of the original canon characterization, or is an extreme interpretation of the canon characterization. The format of [trait]![character's name] manages to quickly and clearly give the reader an accurate depiction of the author's choice of characterization before they even read the story. Example: Werewolf!Harry (whereas Harry Potter is a Werewolf)
See also: BAMF and/or Limp!
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A-Z Fanfiction Guide: Terms to Know
RandomAn A-Z List of all the fanfic terms YOU should know! (Cr. Goes to Angerfire.com for references and information) * this will be updated periodically, so if some things are missing, they haven't been added yet.