is Erurū's shy, quiet younger sister, and a friend to Yuzuha and Kamyu. Like Erurū, she is also named after a fictional flower. It is said that the Erurū and Arurū flowers grow together. When she first meets Hakuoro, she is shy and recalcitrant, running and hiding from Hakuoro at every opportunity and speaking very little. After Hakuoro eventually wins over Arurū's affections, she calls Hakuoro otōsan. Hakuoro wins over Arurū by sparing the life of a baby white tiger, even though its mother, Mutikapa, a large, white tiger with special traits, had killed many innocent people (and despite the fact that almost all the villagers wanted the baby tiger killed; they were however willing to defer to Hakuoro's judgment since his plan saved their lives).
Regardless, Arurū took in that baby tiger and raised it as if it were her own, naming it Mukkuru. After it grows (in an astoundingly short period of time), she begins to ride him into battle, often in spite of orders or warnings to stay away from danger. It is later revealed that Aruru had been severely injured presumably from an earthquake prior to the meeting Hakuoro. Witsuarunemitea healed her for the exchange of Eruru's body, and soul. She is also heavily wounded and presumably has died from an attack from Hauenka and is revived by Witsarunemitea.
Miyuki Sawashiro (Japanese), Sasha Paysinger (English)