Knight of Diamonds

Knight of Diamonds is a mysterious myth of a man who fights evil.

Appearance
Knight of Diamonds is a man who hides his face behind a helmet. His armor, helmet, shield, gloves, and sword are said to be glittering and shining, even in the dark. His face, to those who actually see it, is very recognizable.

Personality
He is a virtuous man, since he went to defend a young Sword Maiden who was being harassed and swindled, and is also shown rooting out and destroying a cult within the kingdom. His reputation is that of an experienced and powerful knight.

Goblin Slayer Volume 8
On a ferryboat, the Knight of Diamonds bursts through a house to confront two conspirators against The King. One of them demands him to remove his helmet, and the Knight of Diamonds obliges by lifting his visor. When the two conspirators call for reinforcements, the Knight of Diamonds declares their fates sealed before taking their lives.