Tools of Characterization
Type of Being
By setting Animal Farm on, uh, a farm, Orwell gets to play with our stereotypes about animals—well, expect he doesn't actually play with them so much as use them to his advantage. The pigs are smart and greedy, the horses are strong and loyal, the cat is lazy, the donkey is cynical and wise, and the humans—yeesh, the humans. They're just a mess.
Speech and Dialogue
Squealer: Fast and with lots of distracting jumping around
Squealer can turn black to white. His language is fast, confusing, and convincing. You want to listen to Squealer because he makes you think that everything is okay. You're not really starving, your life isn't really made up of day after day of hard and unending labor, that moldy turnip is really some delicious cake.
Napoleon: Pomp and circumstance
Napoleon speaks as though his waste material smelled like the lovely aroma of roses. He knows he's the leader, and he won't let anyone forget it.
The Sheep: One absurd line over and over
That about sums it up. The sheep just repeat the same phrase over and over again—they're stupid and easily manipulated. They probably watch cable news.