Sakamoto
Sakamoto is a cat that Nano and Hakase eventually find and begin to care for. They soon give him a scarf that Hakase made that allows him to speak. Sakamoto, who is 26 in human years, acts condescending on the two youngsters, and he is constantly acting like the parent, telling them to refer to him as Mr. Sakamoto and to respect him.

However, he still retains qualities of a cat. While chastising the kids on mannerisms, he may get distracted my a moving toy or ball himself. He also is a major scapegoat for Hakase when Nano gets on her case.