Here’s three things I really loved about it:
1. Harry and Sirius- they never had much time together but the time they did have really influenced Harry’s development, a few wise words from a sincere friend (or godfather) can go a real long way. And this scene was perhaps the most powerfully written in the series for me, we all know what happens next:
2. Dumbledore’s Army- Harry, Ron and Hermione have always taken matters into their own hands; they’ve never waited for someone to come along and save them. And here they have got so many great characters involved in their heroics, which leads me onto my next point.
3. Luna Lovegood- because the weird people are always the best people. Luna’s by far my favourite character because she is so completely herself in all her colourfulness; she’s often ignored, avoided and even ridiculed as a result but secretly she is brilliant. The world needs more Luna Lovegoods. I always thought she had far more chemistry with Harry than Ginny ever did.