Benjamin is the old, irritable donkey who doesn't care who's in control, because he says that work will be the same either way. He is one of the few on the farm who can read, and who still remembers the original commandments. He has an unlikely friendship with Boxer as well. Does Benjamin's character represent a real figure, person, or group of people?
It's unknown for sure, but it most likely refers to either:
The Mensheviks, a non-communist party in Russia, because he's another viewpoint from the pigs but is mostly ignored.
He also could be the older population of Russia, because he is old and skeptical.
He could also just be the skeptical people, who don't believe communism will really help them much.
He could be the Jews, who weren't helped really at all by communism.
Finally, he could be Orwell (inserted into the story, not really fitting the allegory). Just along for the ride, not really in favor of communism/the pigs either.
as an allegory, he represents the average bystander. -- a quote -- "life will go as it always goes -- that is, badly." //he knows what it was like with jones and comes to the conclusion that no matter who is in charge or what changes are made at the farm, it will remain an unpleasant place to be. he also knows of all the injustice occurring on Animal/Manor Farm, but doesn't find is significant enough to address until he sees his only comrade, boxer, be sent to his death, and therefore regrets his silence.