Naa-yan is a small cat who belongs to Arashi Amamiya in the anime Kirarin Revolution. He was born on July 3 and grew up in Osaka, which is reflected in his use of the Kansai dialect. He is part of a litter of kittens given by a neighbor of the main protagonist, Kirari Tsukishima; his siblings are Na-san and Mya-san. Naa-yan has a notably sensitive and emotional temperament, often crying at the slightest provocation. He has a fondness for coins, which he is skilled at collecting and sometimes keeps in a small pouch he carries on his back, and he also enjoys hot springs.

As Arashi's pet, Naa-yan plays a supportive role in the story alongside his brother Na-san. Both cats frequently assist Kirari throughout the series, appearing during moments when she feels sad or frightened and showing her what to do, effectively acting as small but dependable guides. Naa-yan's relationship with Na-san is particularly close, and the two are often seen together. He was adopted by Arashi about a week before Arashi moved away to follow his magician father, marking a key point in his backstory.

While Naa-yan does not undergo a major character arc himself, his consistent presence contributes to the series' lighthearted and comforting atmosphere. His notable abilities include his coin-collecting talent and his emotional expressiveness, which makes him an endearing figure among the cast.