Aqua

Aqua is one of the three main playable protagonists of Kingdom Hearts Birth by Sleep and a Keyblade Master. Aqua is very mature, level-headed, and righteous. She has a very strong sense of right and wrong, so much so that she does not appear to view the world in anything other than black and white. Despite this, Aqua never turns her back on her friends, expressing her concern for Terra without appearing confrontational or threatening. Aqua is the only one of the three protagonists of Birth by Sleep who has been playable in more than one Kingdom Hearts game, having also been the playable character in Kingdom Hearts 0.2: A Fragmentary Passage. Despite her only being a Keyblade Master for a brief amount of time, Aqua proved herself to be extremely skilled, able to use advanced skills such as transforming the entire Land of Departure into Castle Oblivion in order to protect Ventus. Since the ending of Birth by Sleep, Aqua has been trapped in the Realm of Darkness. Although Aqua's official introduction occurred in Kingdom Hearts Birth by Sleep, she was first seen in the secret ending of Kingdom Hearts II. However, we did not see her face until the extended secret ending of Kingdom Hearts II Final Mix.