Dude, You Look Terrible
A common trope in video games is that of the recurring boss: a persistent menace that won't leave you and yours well enough alone. Some are played off as comic relief, inexplicably hopping back from the many grievous drubbings you keep handing down to them. Others treat their defeats a little more gravely, eventually returning as something less than human in their increasingly desperate attempts to seek vengeance.
The following are a list of enemies you'll fight after they've been through some shit. I've tentatively ranked them by how rough they're looking the last time you face them. Oh yeah, and there's probably spoilers.