Hakase Keiichi Arawi

Hakase is the eight-year-old scientist in Nichijou who created the android Nano Shinonome and lives with her and the talking cat Sakamoto. Her inventions and childish demands create the domestic half of the series, especially Nano's attempts to attend school and hide her mechanical body.

Hakase Keiichi Arawi's role, traits, and development

Brilliant, selfish, playful, affectionate, easily bored, and obsessed with snacks and sharks, Hakase combines extraordinary engineering ability with the behavior of a small child. She builds advanced robotics, artificial intelligence, impossible gadgets, and modifications such as Nano's wind-up key, often without considering embarrassment or practical consequences.

Hakase Keiichi Arawi's role across the original work and adaptations

Nano is her creation and family member, Sakamoto tries unsuccessfully to act as the responsible adult, and the Shinonome household gradually connects with Yuuko, Mio, Mai, and the school cast.