Discuss each character in terms of its animal and human nature in Animal Farm.

I would say that Boxer is a character that represents the
essence of the working masses or the individuals who are powerless over their fates. 
They have no choice but to place their trust in the government.  Boxer does whatever
needs to be done and commits himself to working harder and with more diligence in order
to fulfill the government's wishes.  In the end, he is led believing that he is helping
the government, the state, but ends up sacrificing his own life in the process.  Boxer
represents the trust that people place in government, and the lack of questioning it can
result in their own personal and professional demise.  When Boxer dies and when it is
covered up in such a deceptive manner, it reflects the trusting aspect of human nature
and how this can be so easily twisted by those in the position of
power.