The Black Belt seems weak at first, but when you get him to level 10, watch his attack strength sky rocket! The Black Belt's DAMAGE rating is always equal to double his level, unless he has a weapon equipped. So basically, don't equip any weapons on him. Same goes for his defense. His ABSORB is always equal to his level unless he has armor equipped. So when you get him to level 50, his ABSORB will be 50, which is pretty good considering the highest a Knight can get is 74, so the Black Belt/Master is the best character to have. He requires no armor or weapons.