Napoleon (Animal Farm)

Napoleon (named Caesar in the French translations) is the main villain of George Orwell's famous book Animal Farm - he is a fat, greedy pig who turns the farm into a dictatorship paralleling the events of the Soviet Union (which the story was based on) as well as embodying the real life dictator Josef Stalin.

Role
Napoleon helped to overthrow the humans that had been oppressing the animals in the farm with help from his fellow pig, Snowball, but he soon becomes extremely corrupt and cruel- disposing of animals that displease him and adopting policies almost identical to those used by the humans they had fought against.

In the end of the story, Napoleon and his fellow pigs (minus Snowball, who ran afoul of Napoleon and was disposed of) are so corrupt that the other animals can no longer tell the difference between the pigs and the humans.

Napoleon's fate varies in adaptations. In the animated movie, he and the other pigs are killed by the rebelling animals when they stampede into their dining hall. In the live-action version of the book, his exact fate is unknown, but his government collapsed and a family of humans purchased the farm.