NinjasNinjas are a very special kind of martial artists who originally derived from the Soft Bone Kung Fu but took its flexibility levels even further, spicing it up with the art of disguise.
Their main specialty is espionage, so they commonly masquerade as flexible acrobats, which is a popular form of entertainment to buy an easy ticket into almost any noble's or merchant's or politician's house, thanks to the aesthetic values of extreme body-bending.
The smaller Asian frames of these flexible ninjas allow them to transform their bodis to pack into almost any impossible container or ventilation system and sit in there for hours, thanks to their super endurance.
Besides, acrobatic skills themselves can prove useful in combat as well, so no skills are ever wasted, so we can think of Ninjutsu as the dark and stealthy version of Kung Fu :3
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