Jiji

Jiji is a prisoner at the Astronomy Research Institute. He was originally a ninja of Sunagakure.

A few years prior to the events of Sasuke Retsuden, the Prime Minister of the Land of Redaku visited the village while he was touring the region. While there, he hired Jiji to come to Redaku and train an army of ninja, as Redaku was historically a peaceful country with no combat experience. Jiji travelled to Redaku's capital city and was given a room in the royal palace; one of the palace maids, Margo was assigned to attend to him. Over time, Jiji and Margo fell in love, with Jiji deciding to abandon the life of a ninja in order to be with her.

At the last, Jiji was reunited with Margo in Redaku's capital. A year later, they both accompanied King Nanara to the Astronomy Research Institute, with Jiji providing a tour of the grounds as Nanara contemplated how best to restore the Institute to its former glory.

(Source: Narutopedia)