Deletion of Ninjai

Comment: While there is not an enormous wealth of sourcing, the three sources I added (a borderline book reference, a Dutch newspaper article on flash games which begins with 3 paragraphs using Ninjai as an example, and a small article in Black Belt magazine), sum to reach the bar, in my view, of 
Stance: keep
Cited policy: Wikipedia:Notability (WP:GNG)