How does a major character in each of the plays reveal the failure of prevailing assumptions, thereby upholding genuine ethical values by countering the power structure, the majority, or the status quo?

How does a major character (not necessarily the main character) in each of the plays, Dale Wasserman’s One Flew Over the Cuckoo’s Nest (based on Ken Kesey’s novel by that name), Margaret Edson’s Wit, and Arthur Miller’s adaptation of Henrik Ibsen’s An Enemy of the People, reveal the failure of prevailing assumptions, thereby upholding genuine ethical values by countering the power structure, the majority, or the status quo? (For example, with respect to Wit, you could refer to Nurse Susie as a significant major character.) Explain your responses, making specific references to each of these plays.