Shin, the Eastern Kaioshin or Eastern Supreme Kai, is the ruler of the East Quadrant of the seventh universe in the Dragon Ball series. After the other Kaoshin were killed or absorbed, and Majin Boo was sealed in his prison, he has been making sure that he has stayed sealed.
Majin Boo Saga
East Kaioshin lives on a small planet far away from Earth. He came to Earth to warn the Z-fighters that a wizard called Babidi was going to unleash a monster called Majin Boo. He has a bodyguard called Kibito. He took the injured Son Gohan back to his planet to help him get stronger so he could defeat Boo. He shows Gohan the Z-Sword and then, Gohan pulls it out of the rock it was in.