A black cat who wears a scarf created by the Professor, which allows him to speak. Being technically older than both Nano and the Professor, he speaks in a condescending tone towards them, though he occasionally succumbs to his catlike habits.
[In the last episode, it is revealed that Sakamoto used to be [Nakamura)(https://anilist.co/character/44126)'s cat and was called "Taisho". Sakamoto does not want to return to Nakamura because she did not take good care of him, even though she had good intentions.]
