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The design you make takes the base of the ninja camouflage behind the shadows here I put it in the letter d then take the kanji of the word ninja where it shows that the warrior is in the city, representing the letter I with the weapons that most uses the Ninjas. Representing that ninjas are in the shadows anywhere in the city.

This logaría with a simple style in which the line with the lines that is the speed of a ninja is always a nice design