Kouka

Kouka (江華, Kōka?) was a member of the Yato Tribe. She is the wife of Umibouzu, and the mother of Kagura and Kamui. She passed away prior to the storyline of Gintama.

When Kouan, the Yato's original home world, was attacked by the League of Planets, many of the planet's species died and some of the surviving Yatos fled and scattered across the universe. It is then revealed that centuries later, the Yatos that chose to stay had adapted to the mostly deserted planet. Kouka was a descendent and sole survivor of the clan and spent most of her life living on the planet alone. She would later leave the planet after meeting Umibouzu, settling down on Rakuyou to start a family with him.