Teinin

Teinin (literally "Spy Ninja") are a rank even higher than jounin, only the village’s strongest jounin become Teinin. And they are chosen by the village's kage himself. They serve as the Kage's personal bodyguards (and secret police) and are used to dispatch enemy shinobi and to infiltrate enemy villages. Currently the only villages that have Teinin are: Araregakure, Arashigakure, Jiseigakure, Joukigakure, Kesshougakure, Netsugakure and Tenkugakure.