Thanks! :P
1. Are all 5 rebels different? How many decals do you want? Does these rebels have an uniform? Which?
2. I tested all links before I posted them...
3. Do you mean the dark background?
Meoewe!
1. All rebels are same except some colors underneith very, so you should probably just have the lower part of it with the green, blue, whatever be transparent so you don't have to make several decals
2. Well the links don't work for me.
3. The black part.

I've highlighted in red the parts you should just delete for the rebel, then put the civilian decal (If you make that) behind it, insta rebel.
If you delete all the color in those parts and just keep outline, it's what I mean for the cop. But if you want to keep the darker shaded areas a darker shade, just put a shaded area there (A dark transparent layer).
Also, center your decal :3
I hope you get what i'm saying :o