Rimururu is Nakoruru's adopted younger sister, a bond revealed in Samurai Shodown V. As an Ainu priestess-in-training, she deeply admires Nakoruru and strives to emulate her role as a protector of nature, though she must prove her resolve before becoming a full priestess. Her personality is cheerful and earnest, frequently smiling, though she sometimes remains unaware of her sister's deeper burdens. In combat, Rimururu wields a kodachi and commands the ice spirit Konru (or Konril), granting her cryokinetic abilities. These powers manifest as ice shields deflecting projectiles, ice crystals extending her blade, ice pedestals aiding mid-air movement, and summoned ice constructs like hammers, boulders, or geysers. Her fighting style alternates between defensive reliance on Konru and aggressive close-range tactics based on her form, with all moves named in the Ainu language. Within "Samurai Spirits 2: Asura Zanmaden", set between "Samurai Shodown 64" and "Samurai Shodown 64: Warrior's Rage", Rimururu resides in Kamui Kotan with Nakoruru and Haohmaru. She actively supports her sister, especially when Nakoruru shelters Shiki despite concerns over Yuga's lingering influence. Her interactions with Haohmaru provide lighthearted moments, marked by her blunt remarks about his perceived laziness and his comical retaliations. While primarily offering comedic relief early in the OVA, her demeanor shifts to seriousness as conflicts escalate involving Asura and Shiki. Her direct participation in the central battles is limited, but she contributes to defending their home and ideals. After Shiki sacrifices herself for Nakoruru against Asura and Nakoruru departs the village, Rimururu remains behind. Her broader story includes temporarily assuming Nakoruru's duties as the Maiden of Light when believing her sister dead, aiding against threats like Yuga. In "Samurai Shodown: Warriors Rage", Oboro imprisons her for twenty years, requiring rescue before she unites with Nakoruru to seal the antagonist. Her confidence falters in "Samurai Shodown Sen" when she loses the ability to hear nature's voice, prompting her to leave home independently seeking answers. In "Nakoruru ADV", she initially disapproves of Mikato but eventually mentors her, participates in village pranks, and obeys Nakoruru's order to stay behind for village defense during Mizuki's attack, later embarking on another journey.