Metamorph
Many people in the fandom say that Benedict is a "chameleon", because he presents so different characters and personalities with incredible, brilliant authenticity.
Well, I'm not sure whether there is any need to specify more precisely that under the word "fandom" I mean CumberCollective - most my posts here are about BC now (in tumblr 99%, I suppose). But my first fandom in the Internet was Harry Potter (rephrasing famous sentence about Gogol: we all come out from the Rowling's robe)), thus, it's much more natural, imho, to think about Benedict as about a great *metamorphmagus* who don't need any drop of Polujuice Poison to represent a person as whole, with all specific facial expressions, pronunciation, emotions, gestures...