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Ninja - known for being hard to catch and evading attacks which makes a lot more sense for a tank. Also one of these guys would actually have the stamina, manouverability, and dexterity to keep fighting for a long time, without relying on blocking like PLD or just manning it up like a WAR.
Ninja weren't ever known for being anything remotely close to being a tank. A ninja that had to fight had failed at the first thing about being a ninja: blending in and not being seen. Historically, ninja dressed in peasant clothes so that no one would notice them. The idea that ninja dressed in what we now think of as "ninja garb" is actually a modern invention that grew out of kabuki theater (the get up was actually what was worn by stagehands so that they would blend in with the backdrop and not be noticed by the audience; any ninja or assassin that was supposed to pop up out of nowhere would be wearing the same stuff as the stage hands so that the audience wouldn't realize that they were actually an actor).