Most characters in A Doll's House explore these concepts of humna weakness and redemption. Torvald is an obvious choice. His weakness is that he is rigid and conforms to what society expects of him above all else. He is most concerned with how he appears to others. This weakness leads to him destroying his marriage when he fails to come to the rescue of Nora as she faces exposure for her crime. He berates her for destroying him and his image. Torvald fails to redeem himself, even though he puts forth a feeble attempt. Krogstad is another character who displays both of these elements well. He begins the play as a dsiliked character due to suspicious activity in his past and his present blackmailing of Nora. His weakness manifests itself in his desire for self-preservation and his greed. Torvald is able to redeem himself when he dismisses the idea of blackmailing Nora and just wishes to live his life with Mrs. Linde.