TV-Series
Description
Yuki Nekoyashiki began as a white stray cat surviving the snowy mountains. Her life transformed during a family trip where she bonded with Mayu Nekoyashiki, leading to adoption. Mayu offered shelter and a handmade collar charm, forging deep mutual trust. This bond solidified when Yuki witnessed Mayu's grief over a lost childhood friend, cementing Yuki's protective devotion.

Relocating to Animal Town unlocked a new destiny: during a Garugaru attack, Mayu's charm became the Shiny Cats Pact, granting Yuki the power to transform into a human and become Cure Nyammy. Her human form features long pale blonde hair tied with a snowflake-adorned ribbon and blue eyes, typically dressed in an arctic blue dress with white accents. As Cure Nyammy, her hair turns silvery-white, adorned with a crown headband; she wears an off-white dress with blue and pink details and white boots. Her "Diamond Ribbon Style" further modifies this with layered ruffled skirts and a heart-patterned bodice.

Yuki exhibits calmness, intelligence, and independence, often found napping or sunbathing. She maintains a tsundere demeanor, appearing aloof and judgmental at first, particularly towards Komugi and Iroha due to concerns for Mayu's safety. Feline instincts manifest in her aversion to water and occasional battle aggression. Her intense protectiveness of Mayu sometimes borders on smothering, leading her to initially reject alliances with other Pretty Cures and prioritize solitary combat against threats.

Her core relationship is with Mayu, cherished deeply though her protectiveness occasionally causes strain. Early distrust of Komugi and Iroha, perceived as endangering Mayu, gradually shifts to acceptance as allies and friends. She respects Mayu's mother, Sumire, revealing her human form to her openly, and tolerates Mayu's father, Takayuki, despite disliking his photography attempts.

In battle, Yuki initially fought Garugaru monsters with aggression, hindering purification, viewing them purely as threats. Recognizing their controlled pain and loneliness prompted a shift to gentler tactics. She wields the "Amity Ribbon Tambourine" and utilizes the "Diamond Ribbon Castle" for advanced attacks. Her development involves overcoming excessive protectiveness toward Mayu after conflicts, learning to trust fellow Pretty Cures, and embracing teamwork. Following the final battle, she temporarily lost human transformation and speech, regaining both abilities through reaffirmed bonds.