The look of the character could be a mixture of the two fighters. The grappling hook on Scorpion could be used to move platforms.
The companion if added could be slightly demonic, but also a human like figure robot.
The character could have an AOE laser ability that could get rid of waves of enemies or something similar to that. The main weapon of a dagger could be supercharged into a super futuristic dagger that deals more damage and reaches further.
Enemies could compliment the character by possibly changing a normal attack into a combo if hit on the correct enemy or hits a combo.
The suit the character uses could glow, which could be used for passing pitch black areas.
Enemies could apply debuffs to you by fattening you, which slows you down, but maybe increasing your damage temporarily.