I have been working with Heroclix figures to create a Skrull army for my 1/72nd scale troops to fight. They can be used as any alien invaders. I don't limit them to Skrulls and I don't allow them the power to shape shift. Skrulls are large green humanoids with elf ears.
I cut them off the Heroclix base and mount them on sheet polystyrene.
Any figures that look the part get used. I paint the bases black.
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