Toughest guy in anime

Encouraged thread from /a/.

Who is the toughest male character in all of the anime you've seen? A kinda guy that if you messed with you'd get your ass handed to you? and good god don't say anyone from Dragon Ball Z.

Possible people would be Batou from Ghost in the Shell, Brandon Heat from Gungrave, Chad Yasutora or Zaraki from Bleach. Theres a lot others too..

>>26
I don't know about UY being classed as a harem anime - Ataru only lives with one girl, not several. He chases any attractive woman he lays eyes on, but that's the very opposite of typical harem anime where the male protagonist finds himself surrounded by attractive women but rarely has the confidence to hit on any of them...