|Anime||Naruto Shippūden Episode #460|
Tenji lived a full millenium before start of the main story began. He served as an emperor from the Land of So. At the time of his first encounter with Kaguya, his land was in war with Land of Ko over disputed land ownership. Unlike his followers and the residents of the Land of Ko, Tenji desired for peace and tried to avoid direct confrontation with his opponents in order to avoid a war being wedged.
When he meets Kaguya, he is surprised to learn she came "from the stars" but he takes an immediate interest in her once she tells him that she desires for peace, just like him. He allowed her to continue living on his land and fell in love with her. They became lovers and he visited with her every day, and rumors of their relationship reached the Land of So. His devotion to Kaguya's cause for peace caused him to threaten his own followers with death if they dared to threaten violence with the Land of So.
After the emperor of the Land of So tries to kidnap Kaguya and she kills many of his soldiers, Tenji is horrified of Kaguya's god-like powers and ultimately decides to betray his lover in order to prevent a war from breaking out. However, as the two sides attempt to capture Kaguya, she eats the fruit of the Divine Tree and, with her new powers, activates the Infinite Tsukuyomi. As Tenji falls victim to the genjutsu, he asks Kaguya what she is, unaware that she is pregnant with his children.
As an emperor, Tenji was an honorable and good-hearted person, who always cared about his land and people. He was very much a seeker of peace and was willing to do anything to void violence and death, even making peaceful negotiations with his enemies. However, that doesn't mean he harbors disdain towards his enemies, such as when the Land of So tries to use a fabricated map to steal property from the Land of Ko. Tenji loved Kaguya dearly and was protective of her, as they both desired a world of peace. However, his love for his land proved far greater than his for Kaguya, as he was willing to betray and kill to keep from war breaking out.
The full extent of his abilities are unknown, with the exception of him being capable of firing a bow.