five and six
Chapter 10.
I believe it was Old Major in Chapter 1 of Animal Farm.
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Snow ball
He is evil..
He is overthrown by the animals and kicked off of the farm in Chapter 4.
Old Major (the old boar who tells the other animals about the possible future of the farm in chapter 1)
After pigs were discovered sleeping in a bed the commandment was changed from, "No animal shall sleep in a bed" to"No animal shall sleep in a bed with sheets"
Chapter 2
Depends on the chapter.
Boxer
In chapter 7 of Animal Farm, several animals are killed during an assembly of the animals. The animals are killed for being traitors against The Farm.