Aang could do no wrong in my eyes. His character throughout the show was always this adorable 12 year old kid who knew how to appreciate the life he was given, despite being the avatar he never intended for himself to be and having lost his entire nation to the war. However, in the end of the series, we see how Aang was able to become a fully realized avatar and restored balance to a world that was once broken. In short, I absolutely love him.
The suspense, the animation, the tension. This episode had everything. Aang was finally there and able to protect an entire nation when they needed him most. It was absolutely beautiful. Oh and Aang was able to prove he was a total bamf and not just a goofy kid rolling around in the snow. Overall, the perfect ending to season 1.