Harold Mitchell is a sad character as he is the person that does not benefit from the American dream that this play yet is living it. he is average all over yet he does not have any thing to make him stand out from the crowd he is not an ugly person yet he lacks any type of confidence about his looks, yet it is clear he does think about then because of the way that he talk to blanche when they are not their date he says about his cloths and he makes it apparent that he does think about what he wares and his appearance. This is a sign that he is somewhat more sensitive than Stanley as he does not have the take me or leave me attitude.
In scene 7 Blanche has bathed and emerges stating she feels a new person which is her seeing bathing as a cleansing ritual to wash away her sins this would have been drilled in to her coming from the south. Blanch and Stella talk in a sisterly way about Mitch and we realise that she is does have true feelings for Mitch but we also realise that these feelings are not true they are one that are for security rather than the true love that she desperately desires and constituently seeks. This makes Blanche another person that is using Mitch he is put upon by her and I think that that is the story of his life to some degree he has many responsibilities like his mother and also to Stanley although they neither of them may know it , he looks after Stanley to in his worst hours and is there to hear his bragging in his best.
Although Mitch is not in scene 8 he plays a big part in it as it is his absence along with the shocking revelation that Stanley reveals to his wife. His absence makes Blanche very nervous and she talks nonsense in a hurried manner. If Mitch were the there would not have been the outburst form Stanley and the play would have taken a very different route along the tracks of chance. But it is the tension that builds form Stella's new found knowledge and the ignorance to it from Blanche.