Torvald is Nora's husband. by reading the way he treats Nora, you can tell he thinks she's a "feather brain". He doesn't likr to be in amortization. He sees her as if she is just some trophy that he gets to show off and only cares if she looks good next to him. He truly is sexist and probably doesn't value a women's opinion in anything. Torvald says,"Nora, Nora, just like a woman." p.149 'just like a woman!?' what is that suppose to mean?! This quote CLEARLY expresses his underestimation towards women and thinks that she is just some frivolous woman and needs to get a reality check because he doesn't really know what Nora, a woman, is capable of. ;)
Mrs.Linde seems pretty normal so far. She is just an old friend who is widowed now and has lived a hard life. She doesn't seem to be corrupt in anyway so far. i kinda just feel pity towards her.
Krogstad seems corrupt on the other hand. He has committed a crime of forgery and tried to run away from the consequences rather than face the music. He seems like a real criminal because he threatened Nora by black mailing her over a job. he defiantly is not good character. If i were Nora facing this black mail situation, i would just talk to Torvald as soon as possible because it all will just come crashing down on her and the lies will catch up.And if she doesn't confront the situation head on, she'll be digging a deeper hole for herself and Torvald might not forgive her so it's best to just tell the truth before she's in too deep.