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I love, love Donna. Love everything about her, from her expressions, to her attitude problems. I love her relationship with the Doctor, wot she means to him and wot he means to her, their dynamic is just amazing, especially after the heartbreak with Rose and the pining from Martha. It was a perfect combination of sass and defiance and love and respect; she kept him grounded.
          He just wanted a mate, and he got the best one imaginable.