Snowball

Snowball is a pig, he appears to be friendly. It says in the text that he's "a more vivacious pig than Napoleon, quicker in speech and more inventive, but was not considered to have the same depth of character."

The Battle of Cowshed
In the Battle of Cowshed, he was an amazing hero. He got the status "Animal Hero: First Class" for his bravery in the fight.

Kicked out of the Animal Farm
He was accused of being a criminal by the leader Napoleon. After this he got kicked out of the Animal Farm.