Answer:
Napoleon changed from being a simple part of the rebellion against the human master but then became egotistic and proud, demanding the others to 'obey' him. He also knows he's the most educated among them and so, began using that to his advantage against his fellow animals on the farm.
Explanation:
George Orwell's "Animal Farm" revolves around the theme of animals on a farm revolting against their human masters and trying to establish autonomy among themselves. And in that regard, the end result only became more devastating for them, for the greed to be powerful over others led to the dissipation of their 'ideal government'.
One theme pertinent in the novel is that power corrupts the possessor and this is also evident in Napoleon. At first, he was just a part of the rebellion against the human masters. But then, upon realizing that he is 'above' others and more educated, he began to take advantage of his 'superiority' and asked or rather, forced the others to be beneath him. This resulted in a demarcation among the animals, Napoleon putting himself as the "leader" while the other farm animals have to serve him. This is how he became changed after he 'got' the power.
