In spite of a few issues, like the micro-transaction debacle, Mortal Kombat X has been pretty well received by almost everyone, and for good reason. In fact, our only other real qualm with the game is a couple missing characters we really miss.
Smoke, Cyrax, Noob Saibot, Sindel and Rain – to name but a few – are missing from this latest literation of everyone’s favourite gore-fest. But as is the way with modders, they’ve found a way to play as supposedly unplayable characters in the PC version of Mortal Kombat X. You’re going to have macgyver the game a little and tweak a few files, but it should be worth it. We recommend you backup anything before you mess with it.
Thanks to the ingenuity of Reddit user XVermillion, there’s a way to “unlock” some characters NetherRealm Studios never intended you to play, or at the very least not yet.
I backed up the files for Shinnok (the character I’m replacing) and renamed Rain’s files to match those associated with Shinnok’s first costume slot (CHAR_Shinnok_A.xxx and one other, the one that matches Rain’s other one) and moved ’em to the folder and overwrote Shinnok’s old files with the newly renamed Rain files.”
Sounds simple enough. Rain was probably intended as a DLC character, so here he is for free. Enjoy.
Source: PC GamerForum discussion