This is really more inspired by Grey Worm, but indicative of all the Unsullied.
The Unsullied are one of my absolute favorite parts of the saga. I cannot get over how awesome they are, and they haven't even done anything. They have one of the most shocking and incredible descriptions ever and easily some of the best chapters in A Storm Of Swords. Seriously no other science fiction or fantasy army has training harder than the Unsullied.