Monsoon from Metal Gear Rising Revengeance.
He basically is a cyborg that uses two daggers and he can split his entire body into pieces making it impossible to hit him. He also throws Red Phosphorous grenades at you making it hard to see his attacks.
I loved Monsoon's battle, it kicked ass.
The only fight I didn't like was the female Wind of Destruction- I can't even remember her name.
Not because it was long or hard, but because it was so anticlimactic and bleh.
I always hated Grim Treant in Dawn of Mana. It always takes so long to end the fight. So, as the name suggests, he is a tree, there are glowing crystals inside his mouth that you're supposed to hit to cause damage, but the only way to open his mouth is to inflict fire damage to him. If you run out of Salamanders(you only get about three for the whole level), then you're boned and have to rely on him tossing these exploding pumpkins at you. Problem is, his tendrils are attacking you the whole time, what with sweeping across the area as well as piking through the ground. Not only that, but he summons enemies to attack you and get in the way for when you actually get the chance to throw the pumpkin. He also has a small chance to shrug off the fire damage without getting panicked so you lose your chance to attack him.
Annoying tree, I tell you hhhhwat
