Ku (Nickname meaning "bow". Pronounced "Koo", with an elongated vowel.)
Her nickname comes from her proficience in using the bow and arrow.
Her real name is "Reipeka". It is customary within her people to use nicknames when calling each other, rarely using their real name.The Ainu terms are "Upas-nuyna" ("Snow hider" or something like that) and "Cape-kamuy" ("Cat God/Spirit", what Ku appears to be.)