Rain is the latest DLC character for Mortal Kombat 9 along with Skarlet and Kenshi, while his announcement trailer was no more but a few days ago his story trailer is here. The story of Rain's is pretty unique and he is definitely pegged as one of the villains of the game rather than on the side of the good guys. The video shows him doing HORRIBLE things to Liu Kang but given that he has mixed abilities of a few Mortal Kombat fighters he is definitely one of the better DLC characters.
Rains story is one where you do not feel any sympathy for him, he was an orphan who later on grew up to be a strong but arrogant fighter but once he crossed too many lines he defected to Shao Kahn and serves under him now but loyalty means nothing to him as long as he gets complete power with no one to tell him otherwise.
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Rain is the second last DLC character for Mortal Kombat 9, the last character is still a mystery and can be ANYONE from either the classic Mortal Kombat games or even a Character from the PS2 era of games, but one thing is for certain. You can rest assured that Netherrealms will DEFINITELY save their best for last, and whether they will make future DLC characters is still under question, for now let's wait and see what the future holds.