GAME OF THRONES
Grey Worm is a character who debuts in the third season. He is played by Jacob Anderson. Grey Worm is the commander of the Unsullied, the warrior-eunuchs of Astapor whose reputation for combat is without equal.
As per Daenerys's instructions, the Unsullied officers select their own leader to act as their official commander, reporting directly to her. Grey Worm is selected, though it is not established how. Upon reporting his election to Daenerys, she finds his name and its associated practice– given to him by the Good Masters to remind him that he is vermin– distasteful, and tells him that he and all Unsullied may use their original names or chose new ones they like. Grey Worm agrees to disseminate the instructions to the other Unsullied, but elects to keep his. He considers it lucky, and since Grey Worm was the name he had when Daenerys Stormborn set him free, that is the name he shall keep.