The East Kai is one of the regular Kai's in Dragon Ball, she is in charge of ruling over the eastern section of the mainstream galaxy.
East Kai is the kai that rules over the east quadrant over the mainstream galaxy in the Dragon Ball series. Little is known of her origin, though it is known that she with the other Kai's often combine there power to stop evil foe's that prove to much for anyone of them solely. Before the start of the anime series, North Kaio stated that many years ago, there was a thug named Bojack that was powerful and threatening the safety of the galaxy. To stop this attack, the Kai's had to pull together there powers, and they safely locked him in a planet at the far end of the galaxy.