Mortal Kombat II is a 1993 arcade game and the second title in the Mortal Kombat fighting game series. Due to memory limitations for the title two characters from the original Mortal Kombat, Sonya Blade and Kano were excluded, reasoned by Boon as them being the least-picked characters in the original game, and the development team’s desire to introduce more new characters into the game. [Info from Wikipedia]
On the Mortal Kombat Secrets website there are many interesting concept arts and screenshots from the early development of the game, in wich we can notice some removed characters as Kintaro and a female kick-boxer. Also a couple of beta images for Jax, Johnny Cage and Baraka shown their original designs and we found out that a Blade Spin Special Move was removed from Baraka, because it was too powerful. You can check the original article on MKS for more info!