Aruwe is a young girl belonging to the Kororu people, who are also referred to as the little folk. Her background is defined by her role as a living offering given to the Valley God, which is the reason she is the only person permitted to live within the valley.

Within the valley, Aruwe takes on the responsibility of caring for Kai and maintaining the various buildings and facilities, working diligently to keep everything in good order as part of her daily routine. For her own specific reasons, she addresses Kai as god, having come to the valley as an offering. She is shown to be a caring presence, as she is seen watching over Kai when he loses consciousness and is by his side when he awakens from a vision. Her declared intent is to stay with Kai as the vessel of the Valley God.

Aruwe's role in the story is closely tied to Kai and the valley. She is a member of the Koror people who believe Kai to be the Arbitration God. Following Kai's defeat of an Org, she becomes involved in his life, and along with others like Porek, her group participates in training activities. While her notable abilities are not extensively detailed, her primary functions are the domestic care of the valley and the direct care of Kai, ensuring his daily needs are met.