Shugo (守護) is an official post named by the Shogun, which oversees a province (kuni) in Japan.
The post was initially created by Minamoto no Yoritomo, in need to capture Yoshitsune but the actual motivation is to roll out the rule of the Shogunate government throughout Japan. It is actually intended to replace a job of Kokushi, which is appointed by the Imperial Court in Kyoto. In official manner, Gokenin in each kuni is supposed to belong to Shugo, but in practice, the relationship between them is fragile.
Shugo is also the first name of Shugo Kunisaki, one of the main characters of the Japanese Anime ".hack//Legend of the Twilight"
Shugo and Rena continued to play The World together, and soon made friends with a variety of characters, including the rare item hunter Mireille, the powerful fighter Ouka, the peaceful Hotaru, and the swordsman Sanjuro.
Shugo and his Twilight Bracelet are mentioned by Jun Bansyoya during his recap of the events of Project.hack.
According to the anime, Shugo's second kiss was with Reki; in the manga, Shugo's second kiss was with Zefie.