What are some examples of bosses or enemies that are “damage sponges”?

Which enemy from JRPGs do you consider HP or damage sponges? Basically which enemies have really high HP, relative to expectation or HP of enemies before and after.

They don’t have to be difficult to kill. Im actually more interested in those, ones that are just tedious to kill because it takes a long time due to their high HP or defense.

I imagine most will just come from Hard Mode bosses, since they usually have more HP in hard mode, but curious to see the ones in normal or even easy mode.