I still play this one MMORPG called Priston Tale. There is a class called Mechanician and it's basically a tank class.
Mind you, all classes can wear shields but not all can tank. The Mechanician class is a lot like Naofumi in that the defensive stats are off the charts and even the defensive skills make an already tank class even more of a tank. In PvP, their damage is not great but cause other classes can barely harm them aside from the lame pike class (Scythes and Spears), the Mechanician class just has to tank and take away the other player HP one attack at a time and eventually win.
I am kind of seeing Naofumi as a Mechanician class lol.