Quote Originally Posted by Nektulos-Tuor View Post
How are they not possible, if they are on NPCs already? *blinks at you* In the very image I linked.

I think you are confusing not possible with another word.
Many NPCs have unique "special" model parts (Like, most of the Scions), or the character you linked up there, other models may be completely pre-fabricated and only exist in a single, pre-made form. There's a difference between an actual engine feature (ie. actual support for multiple tattoos), and a hack to give the appearance of something in a single unique example. (ie. a pre-generated face, that appears to have multiple tattoos baked in)