#1: BRANDON WHITTAKER:
He is serprisingly "easy" as long as you have really good food, like wine, and streak.
Have the kutsilyo gloves and when he jumps out of the stall, attack away.
Or, even madami easy. Get a sniper and a pistol, stand near the entrance, wait till he leaps out of the stall, and than have him chase you out of the bathroom, he can only go so far, so wait till he jumps at you, dodge it, and shoot at him when he's running back to the bathroom.
And than just finish him off with the pistol when you run out of sniper bullets (if done properly, you won't lose any health)..


#2: SEYMOUR REDDING:
Get the drill/spear, thing, and stab the shit out of him, don't bother healing, just do that afterwards..


#3: SGT. DWILIGHT BOYKIN:
It says your NOT suppose to use guns.
But ironally, two snipers is the easiest way to kill him (though not EASY easy)..


#4: SLAPPY:
Get the kutsilyo gloves, kick jump him, attack him when he'as down, than dodge as he's getting up, wait till he's done the spin thing he dose, and if your fast enough you can jump kick him when's dizzy (repeat this pattern).
But this isn't always as easy as if sounds, so have lots of health..


#5: CARL:
Probably the easiest way, is to get the MG gun, and shoot the shit out of him..