If you admire hard working individuals who blindly follow whatever they are told, then Boxer is your man. I admire his ability to work tirelessly for the good of all; I do not admire his inability to distinguish truth from falsehood. If you admire someone who is able to manipulate others, to concentrate power in his hands for whatever purpose, who seems devoid of any morality,then Napoleon is your man.
I find it hard to find anyone to admire in this chapter, although there are characteristics of some of the animals that are admirable. The animals' (our) gullibility, however, tends to overshadow their qualities.
First of all, you will have to think about this yourself a little, since no one else can tell you whom you admire the most. However, here are some things to think about as you make your choice:
Boxer - he is a very hard worker in this chapter, as it tells us in ch. 3: "now he seemed mor elike three horses than one; there were days when the entire work of hte farm seemed to rest on his mighty shoulders."
Benjamin - he continues to work hard, the same as he has always done. There is something to be said for his consistency.
Snowball - he organizes the other animals into committees and gives them each special jobs to do.
Napoleon - he hides away the puppies and begins to train them, working for the education of the future.
The pigs in this chapter begin to show their true intelligence and manipulative skills, as they work to convince the other animals that they need to be in charge rather than actually working, and that they should get all the best food so they can keep order so that Jones will not return. Whether you admire them for this or not is entirely up to you.
Boxer did things for the community at large which makes him admirable.
Chapter 3 of animal farm describes life and events on the Animal Farm after the first harvest under under control of animals. During this period every animal on the farm is doing its best to contribute to the success of the farm and learn skill like reading and writing. The only exceptions are Mollie and the cat.
Towards the end of the chapter the disagreement between Napoleon and Snowball are also becoming apparent. Also the episode of missing milk takes place.
So with exceptions of Mollie, the cat, Napoleon and Snowball all characters appear to be good and sincere. But frankly speaking I find nothing worth admiring in them.