In "Animal Farm," characterize the animals according to their human traits and characteristics?

Well...it isn't hard to figure out who Orwell wanted to
represent whom as their characteristics pretty much match their historical
counterparts...but I'll give you my take on it.

Farmer
Jones represents Czar Nicolas. He is selfish, lazy, and not too bright. Because he
thinks only of himself, the animals are neglected and the rebellion
begins.

Squealer is devious and a lie-teller. He'll do
anything for the cause. He spins the truth to get people to believe in his cause.
(Media)

Napoleon is ruthless, brutal, fat, lazy, and smart.
He can force others to believe what he is doing is good for them...when he only pleases
himself. (Stalin)

Snowball is smart, a little selfish, but
he believes in the cause. He is more concerned with himself than with others...but he is
willing to work for what he believes (Trotsky)

Boxer is
dumb, strong and loyal. He does not question because he can't think of what to ask, and
he believes what he is told (the communist people)

Those
are some of the main characters for you. You may find others on the
link.