Once again I have found something within JJ2 which is probrally only new to a select few. Anyways, I decided to see how I could interact with the objects in the JCS, and for some reason I chose Eva. You might have noticed shooting Eva is pointless and has no effect.
Unless you use the electroblaster.
If you fire multiple rounds of the electroblaster at Eva(best done when ducking, so you can see the effect) she gets surprised.
This has no real useful effects except for in cutscenes. You'd have to add some of her sprite into the tileset and put on a foreground layer to cover up the electroblaster shot however(Remember, only her face changes.)
EDIT- It just takes two electroblaster shots, the second one fired promptly after the first. As in tap the fire button twice