Women characters took on the moral role in Uncle Tom’s Cabin. They were dipicted as mothers, wives, and mentors who provided moral guidance to the slaves. These women include Mrs. Shelby, Legree's mother, Mrs. Bird, and Mrs. St. Clare (Grandma).
Stowe's portrayal of men is somewhat different. They are depicted as gruff, greedy, and morally weak. Uncle Tom does not fit in with the other men in the novel. He has high morals and is a great teacher. He is a role model and acts as a father, brother, and uncle to those with whom he comes into contact.
As far as feminism goes, Stowe never comes out and really makes a case of it. There are specific instances where we can see a link between the oppression of woman in relation to the oppression of slaves, but I've never really seen this as a feminist declaration. I may have to sit down and read it again in a different light.