Ninjas are coming soon... after they come out of hiding

Where did the Ninjas go?
As I have been completing Ninjas I have put them down next to the flat Construction Workers, but they keep disappearing. I cannot share them until they reveal themselves.
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I caught something out of the corner of my eye, on the bookshelf... I think it was a Ninja hiding among the books. They move quickly and hide is shadows so I am not sure.
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So, I have convinced the Ninjas to come out and show themselves with the promise that I will not reveal their names. They will go by numbers to protect their identities.

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They are currently posing for pictures and will arrive on the Oma's Patch etsy shop soon.
Numbers 1-6 will be posted, with felt patch around the eyes varying for different skin tones.