Who do you think will be the pivotal characters in Harry Potter 7?

Question:

Who do you think will be the pivotal characters in Harry Potter 7?

Of course the trio (Ron, Harry, and Hermione) will. Who else do you think will be crucial to the plot.

NOTE: PLEASE do not tell me that only JKR knows what will happen for sure. I KNOW THAT!!! I want to know YOUR theories. (I have to put this note due to silly replies I've gotten in the past. Sorry).

Additional Details

2 weeks ago
I think Ginny, Dobby, Grawp, and Draco will play crucial roles. I also think the DA will re-form. What do you think?

2 weeks ago
Hey TWK I was asking for theories. Despite my disclaimer you still had to waste my time and give me a silly answer.

Best Answer - Chosen by Asker: 2 weeks ago
I think Ginny, Dobby, Grawp, and Draco will play crucial roles. I also think the DA will re-form. What do you think?