Aveline de Grandpré is the protagonist of the Vita title Assassin's Creed III: Liberation. She is the first female assassin protagonist in the series, and her adventures take place in the same colonial era as those of Connor Kenway, the protagonist of Assassin's Creed III. Unlike Connor, whose experiences are relived by his descendent Desmond Miles, no one is experiencing Aveline's story through an Animus in the present day. The backstory of Assassin's Creed III: Liberation is that the video game itself is a product released in the Assassin's Creed universe by the Abstergo Corporation to hide the existence of the Templars and make the Assassins out to be psychotic murderers; the series of events witnessed by the player of the game paint Aveline as an angry murderer who arbitrarily decides that people should die, often for trivial or poorly-thought-out reasons.
However, a hacker group called "Erudito" compromised the game's code, and when the player completes such a section, they are given a backdoor into the real record, which accurately portrays Aveline's struggle against the nefarious Templars for control of the Americas.
Aveline has been confirmed as a multiplayer character in Assassin's Creed IV: Black Flag, and a singleplayer section of the game exclusive to PS3 and PC pits the player as Aveline in a strange sequence that has very little to do with the rest of Assassin's Creed IV's story.