Skarlet Story Trailer She is a bloody bad ass LITERALLY
Skarlet is one of the first few DLC characters to roll out for the PS3 / 360 game Mortal Kombat 9, she was originally a game glitch in Mortal Kombat 2 but people liked the look of her (I mean almost all the women looked the same right? Kitana, Jade, Mileena etc) So developers have turned her into the Pinocchio of gaming, she became a fictional dream to a real player.
While she really didn't have a story before she is apparently Shao Kahn's "Ultimate Weapon" only to be used as a last resort, she is made from the blood of the best warriors along with a bit of sorcery thrown in and like Mileena she is deadly loyal to the dark emperor, anyone who plots against him is destined for death.
At the end of the trailer you can see that Netherrealms is indeed planning future characters; Rain, Kenshi and a mysterious 3rd character (Kintaro is a possibility as I showed here) will make a future appearance on the DLC. While the price / release date of Skarlet is not available you can expect her to hit a PSN / XBL near you soon.