How do the minor characters in A Doll's House develop the drama?

In Ibsen's A Doll's House, Nora takes center stage. She and her husband, Torvald, are involved in much of the action and drama of this play. The minor characters, however, play very important roles and help develop the drama considerably. Perhaps the most obvious minor character is Krogstad; he really adds to the tension of the play as he tries to blackmail Nora to help him get back his job at the bank. Though he only appears onstage at a few points, the information he holds is powerful and increases Nora's agitation as the play continues.

Two other characters contribute to the drama of the play. Mrs. Linde and Dr. Rank, who are minor characters, also act as foils to Nora and Torvald, respectively. Through these two minor characters, the audience is able to see Nora and Torvald more clearly. Nora, in particular, reveals secrets to Mrs. Linde and even Dr. Rank; these secrets allow the audience to see her true character. Her revelations stand in stark contrast to her demeanor whenever Torvald is around, which in turn increases the drama and tension in the play. Without the minor characters, A Doll's House would definitely not be as tense and dramatic.