These are the ninjas that love to not be known in fact that is their skill they try to not get caught in the act of ninjering (it's a made up word) they are like secret agents but take out the agent part and replace that with ninja you would usuall find them in an Asian country doing a job for their sensei.
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Ninja Penguin
HumorNinjas are very mysterious people but they have got some fun in them this book will talk about different types of ninjas
