Jade is a fictional character from the Mortal Kombat video game series. She was introduced in in 1993's Mortal Kombat II as an unplayable secret character that was a green palette swap character of Kitana and has debuted as a player character in Ultimate Mortal Kombat 3 in 1995. Since then, Jade has become a stalwart supporting character in the series, also appearing in some other media and merchandise in the extended Mortal Kombat franchise.
In the games, Jade's backstory is of an assassin in the service of the otherdimensional emperor Shao Kahn of Outworld. Plotwise she is linked to Princess Kitana, usually being her longtime friend and, in most of the later games, a fellow patriot of their home world of Edenia that was enslaved by the evil Shao Kahn and an ally of Earthrealm warriors. In non-game media and some of the games, she is just a minion of Shao Kahn.
She has received mostly positive reception, largely due to her sex appeal, and is often regarded as one of the best characters in the series in terms of gameplay.
http://en.wikipedia.org/wiki/Jade_(Mortal_Kombat)