Question: how to unlock all characters in killer instinct?
Answer: Fulgore. How To Unlock: Fulgore will be unlocked after an automatic download in March 2014, as part of any Paid DLC Pack*.
Glacius. How To Unlock: Glacius can only be downloaded via the Paid DLC*.
Jago. ... 
Orchid. ... 
Sabrewulf. ... 
Sadira. ... 
Shadow Jago. ... 
Spinal.