Nora: A young woman who married very early and had children also very early in her life. She had basically been her husband's play toy, always trying to outdo herself by entertaining him, not by nurturing him. She is a nurturer, though, but she had not been allowed to blossom as one: When she took care of her father and obtained money to help her husband's health, she was never appreciated for it. So, since the only way she felt attention and appreciation was by playing the role of a dolly, that is what she became to everyone. She shows herself as shallow, airheaded, clueless at times. She doesn't seem to appreciate the value of things, and she is no mature enough to understand consequences. She lives a life of fantasy expecting that one day a miracle will happen and her husband will see her for who she is. In the meantime, she continues to play around her house like the doll she has become.
Kristine is the antithesis of Nora. A woman who has done nothing but nurture in her life, is now alonw. Her husband dead, her children gone, she has been down and out of luck for a while. She comes to Nora to ask for a little bit of help finding a job on Torvald's bank. She does appreciate what little life gives us because she, herself has only had that: very little. She is the mind and conscience of Nora, and she tolerates but advices her into telling Torvald the truth. She sees the superficiality of Nora and Torvald's marriage. Her friendship to Nora is so big that she rather see Nora exposed and freed from Torvald than still living under that farce.
In the end, the two women were alike in that both recognized how little society had to offer them. Nora left her family, indignant, dissappointed, and quite broken. This is what Kristine had known all their life. If anything, the one thing the two women have in common is that society views them as second class citizens.