Roku, a three-year-old male cat with a rugged build and low, rumbling meow, presents a stern facade that belies his warm-hearted personality. Rescued as a stray by Nana Ōkami—a Sunny’s Pet Store clerk—he now shares her home with Hachi, Haru’s biological younger brother. Though his scarred physique and gravelly voice suggest a hardened past, Roku displays unwavering kindness, particularly toward those who share his history of street life.

Having survived the challenges of feral existence, he approaches Haru with instinctive empathy during her visit to Nana’s home. He reassures her of their safe haven and openly declares her family, bound by her kinship to Hachi. Roku actively supports Haru’s adaptation to domestic life, demonstrating trust in humans through his own behavior and quietly reinforcing the unspoken loyalty among strays-turned-companions.

His journey from alleyways to a permanent home subtly mirrors the narrative of healing and belonging, emphasizing resilience and the quiet strength of chosen kinship over blood ties.