Krogstad Or Mrs. Linde Character Analysis

How would you perform the role Krogstad or Mrs Linde in the play in order to achieve desired effects?
I have chosen to write about Krogstad and I think that the desired effect on the audience in my opinion is to be seen as the villain but without being to evil at moments.
Krogstad defiantly has villainous attributes which at times seem dominant in this character, but Krogstad is embittered by life, as he was rejected by Mrs Linde, whom he proposed too and he lost his standing in society through committing forgery of a signature on a document to obtain money for his children in a time of hardship.
To show these villainous attributes for example when Krogstad goes to see Nora near the end of act one and it begins with him knocking on the