Let the courts and kings of the World have their jesters, fools given permission to say to their sovereigns what others can’t. In this way, these rulers can learn about discontent among their people in the form of a joke. Celestia and Luna encourage their ponies to speak with them frankly, they don’t need a jester, but they do have a fool.

This fool doesn’t wear any bells. Everypony knows he’s an idiot, but nopony but a few are supposed to know he is the Diarchy’s Own Fool. He says what the sisters don’t want other ponies to think and ponies, not wanting to be seen to be like him, will often go with it. This pony’s name is-

“Blueblood~” Celestia sing-song’d.