Kogo is a troublesome kappa who loves hot baths. In fact, she refurbished her very own hot bath high up in the mountains, and her constant diet of fish and cucumbers gave her such a heavy bottom figure. When it came to troublesome, her antics range from the innocent to the horrendous; for instance, looking up women's skirts to drowning the local cattle by wrestling and sitting on them.
For her theme song, it has a very traditional Japanese aesthetic with a relaxing ambient sound, fitting for her love of hot baths. The light BOINGs were used for the comedic effect of her troublemaking, while the heavy BOINGs were used for denoting her soft thighs/butt and curvy shape. The kabuki sound effects in different pitches throughout the theme were also used for weirdness, given that being a kappa is a creature.