However, there are many anime heroes who get completely revolted by the concept of being weak. Whether training themselves so that they'll never need help or lambasting those who can't defend themselves, their callous dispositions and their obsession with strength reflect poorly on what it means to be a protagonist, creating consequences for the story.
Kenpachi Zaraki blurs the lines between hero and villain more than any other Bleach character. His entire life's philosophy is about enjoying struggle, to such an extent that he will deliberately handicap himself with an eyepatch that reduces his spiritual energy.
Zaraki loathes weakness and will not allow it anywhere in his squad. Those who follow him do so with strict respect for his chain of command and a willingness to follow his orders. His methods may be questionable, but the results Zaraki gets make his value as a shinigami irrefutable.