10. Professor Filius Flitwick
Small but deadly, Flitwick proves that dangerous things can still come in small packages. The diminutive character was Charms Master and his bravery is commendable. And aside from his prowess with Charms (proof that Dumbledore considered him the best in the world presumable), his bravery in standing up to both Dolores Umbridge and the Carrows in order to protect the students adds to his power. He was also a duelling champion, which just goes to show that height isn't everything.