Oka

Oka is a Nopon in Xenoblade Chronicles. She is Riki's wife and the mother of his eleven children. She can be found in Frontier Village at Riki's House between from 9:00 to 18:00, pacing back and forth and watching her children.

She does not seem to think too highly of Riki, mentioning that "The littlepon have been getting big while [he] has been away," and even going so far as to threaten divorce if Riki does not make enough money to clear his debts and improve their standard of living. She is said to have quite a temper as well, during a quest, Riki tells Dabidabi that Oka was so furious with him for asking her to marry him that she slapped him, although still said yes.

Riki's return
She is present in only one cutscene, in which she is introduced; after the defeats of the Leone Telethia that has been menacing the safety of Makna Forest and returns of the party to Frontier Village, Oka and her children come to greet Riki with Chief Dunga and some other Nopon. Chief Dunga tells Riki of another prophecy (that he just made up), that he should accompany the party further, and Oka assures Riki that he knows best.

Epilogue
She is mentioned in the epilogue; Reyn points out that she will be angry if Riki does not bring back enough fish to feed their children, meaning that she survived the destruction of the Mechonis and the Bionis

Trivia

 * An interesting tidbit about Oka is that in the cutscene which she appears, her mouth does not move when she speaks. This likely was unintended, yet not fixed for the 3DS port.