ok, from bottom left to top right

Shang Tsung (MK) Scorpion (MK) Sub-Zero (MK) Shinnok (MK Mythologies) Shujinko (MK6) Kai (MK4) Kung Lao (MK2) Quan Chi (MK Mythologies) Reiko (MK4) Kabal (MK3) Kano (MK) Cyrax (MK3) Sonya (MK) Jarek (MK4) Striker (MK3) Rain (MK3) Ashrah (MK6) Sindel (MK3) Kitana (MK2) Johnny Cage (MK) Liu Kang (MK) Reptile (MK2) Baraka (MK2) Raiden (MK) Kenshi (MK5 DA) Li Mei (MK5) Dairou (MK6) Sareena (MK Mythologies) Tania (MK4) Darrius (MK6) Noob Saibot (MK3) Smoke (MK3)Nightwolf (MK3) Ermac (UMK) Mavado (MK5) Kobra (MK6) Kira (MK6) Fujin (MK Mythologies) Frost (MK5) Havik (MK6) Jax (MK2) Bo' Rai Cho(MK5) Hotaru (MK6) Drahmin (MK5) Mocap (MK5) Mileena (MK2) Jade (MK3) Sektor (MK3) Hsu Hao (MK5) Nitara (MK5) Onaga (MK6) Kintaro (MK2) Shao Khan (MK2) Goro (MK) Sheeva (MK3) Moloch (MK7) Blaze (MK5)

however there are 4 characters missing in the picture: Chameleon and Khameleon, and the main characters on Mortal Kombat Armageddon Dagon and Taven