I'll take Red Hood any day over Scorpion and Sub Zero, but honestly, I like Batman, his characters are cool, but if we need more characters from the Bat-universe, couldn't get get someone that isn't just all about martial arts and gadgets. I mean we have some other great choices,
-Poison Ivy (with vines to grab people, poisons for damage over time or stun powers from toxins)
-Clayface (could morph his limbs into long distance weapons turn into a puddle or even copy the opponent Shang Tsung style)
-Ras Al Guhl (with a kind of sword/fencing style of combat)