Nahoko uses shadow magic to appear out of thin air and assassinate her targets. I thought it would be neat if she manifested weapons (chain, blades) and costume bits (tattoo, hair chopsticks) from shadow. The purple lock of hair suggests that the shadows are now a part of her physical being as well, perhaps taking her over. A subtle floral print on her outfit and white kabuki-like makeup complete the look.
Fun fact: In the lore, she comes from the same Asian-inspired world as Maneki Neko.
Texture resources from CGtextures: [link]
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And see the complete PROJECT MERCURY Gallery here: [link]