Midna (true form) from the Twilight Princess series of Zelda. My love for this character - she's so sassy, fun and quite possibly one of the best aids for Link so far (heck, definitely beats Navi any day! so annoying...) I hope Nintendo brings her back soon!
PLEASE NOTE: I am practicing semi realism, so I have taken some liberties with her features to make it work to suit my composition, style, etc. I also generally interpret the characters in my fan arts rather than go all literal, hence the deviation in the details from the official art.