Rinia is the elder daughter of Gyes, the warrior chief of the Dorudia Tribe. Due to her stupidity, her grandfather Gustav sent her to the Magic Ranoa Academy in order to gain knowledge; however, because of her linage as a royalty of the Beast Race, Rinia was treated with great care and became pampered. Rinia, along with Pursena, became arrogant and acted like delinquents.
The duo eventually became underlings of Rudeus Greyrat when Rudeus found out that they were the ones that broke Zanoba's Roxy figurine, thus he tortured and humiliated them into submission.
After graduating, she become a peddler selling goods from Asura to the North and vice versa; however, as she gained her funds through loaning, eventually she found herself unable to pay back her loans, thus she was taken into custody and turned into a slave. One day, she escaped and ran away. She was then found by Eris and became her pet. Currently, she is Rudeus' slave as he paid back her debt. She is also the representative director of the Rudo Mercenary Company.
