Kaji was born into an average family and from childhood he showed efforts to invent. His parents encouraged their son and therefore contributed to his development in this area. Now Kaji has a network of small workshops for the manufacture of household mechanisms and is actively developing robots using steam engines.

Sarcastic. Determined and calm. Callous but caring. Talented and a genius. Loner, introverted and socially awkward. Gloomy and aloof.