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Pacifist Sisters
Nakoruru and Rimururu (referred to ingame as "Rimnerel") appear in Warriors Rage in a story-only capacity. Nakoruru appears as a nature spirit, imploring you to fight the evil Oboro and awaken her sister. Rimururu is hibernating in a block of ice for some reason.
Ainu Have to Stick Together
In Capcom vs SNK 2, Nakoruru's intro and winposes occasionally feature another girl. This is Manari, a singer and fellow Ainu who first appeared in the PC/Dreamcast visual novel and anime OVA
Nakoruru: Ano Hito kara no Okurimono.