For me, the character that I admire the most at this point in the story (and actually pretty much at every point) is Boxer.
In some ways, I feel sorry for Boxer. He is not really all that smart and so he ends up getting used by all of the smarter animals. In that way, I don't admire him.
However, I really do admire him because he is so unselfish. He is always willing to do his very best to help the farm as a whole. In fact, his efforts are really quite amazing -- he always goes beyond just doing what is comfortable. Instead, he really pushes himself to help the farm as much as possible. This is why he is admirable in my mind.
I appreciate Clover. To this point she has been faithful to the group of animals, the cause, and her special friend Boxer. This is becoming a more dire situation for the animals every day. She has been one to point out that there seem to be discrepancies in the accounting, or the difference between how the animals were treated in Jones' time and now. Even though she knows things in her head are questionable, she continues to be the best nurturer to others or loyal subect or faithful friend as much as she can.
Boxer is worthy of admiration too for his hard work, but you have to wonder if when hard work is done in vain, is it really worth working that hard, not smart?
I admire Boxer the most.
According to Chapter 6 of Animal Farm, during the construction of the windmill, he worked extra hard to built the windmill from scratch, carrying the boulder to the top of the quarry and throwing them down, which was very taxing to most of the animals involved in the construction. This exemplifies the determination and steadfastness of spirit shown by Boxer in getting things done, no matter how difficult and tiring it is, and this garner much respect amongst the animals. This amazes me, his extraordinary work rate no ordinary humans can match up to.
But, I do not admire him in respect to his gullibility. He is not that smart and is too naive to believe Napoleon's lies. He is not intelligent enough to realize that his basic maxim- "Napoleon is always right" is in fact untrue and wrong to start with, thus culminating to his death later in the story.