How to reduce negative consequence for the person I plagiarized my assignment from? Due to some personal reasons, I didn't get to complete my semester end project. So I copied my friend's project and submitted it without major changes (I know I was a fool to do that). Now we are caught and my TA told us that both of our scores will be zero. I have begged the TA to give my friend his score, at least. I don't know what is going to happen. I am obviously going to fail this class, but I don't want my friend to fail it because of me. What should I do?
Whether your friend deserves a grade or not depends whether he was a willing accomplice or an innocent victim.  If he was a willing accomplice, then probably both of you failing the class is the best thing you can hope for (at least for most US universities, where there are consequences besides failing if the professor or TA chooses to report it).  If he was a victim (he did not share his project with you with the intent that you could just copy it), then he certainly merits a grade.

In any case, the proper thing to do is for you to arrange to meet the professor in person, explain the situation, and apologize.  If your friend was a knowing accomplice, both you and your friend should go together.  Then it is up to the professor.