Koga Ninja/Origin

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Origin
Koga Ninja is based off the ninja of Kōga-ryū (甲賀流, "School of Kōga"; occasionally spelled "Kōka" in English). It's an ancient school of ninjutsu. It originated from the region of Kōga (modern Kōka City in Shiga Prefecture). Members of the Koga school of shinobi (ninja) are trained in disguise, escape, concealment, explosives, medicines and poison; moreover, they are experts in techniques of unarmed combat (Taijutsu) and in the use of various weapons.